New Order Email rejected “550 Subject contains invalid characters”

Hi @harryf98 ,

If possible can you please share your System Status Report, that will help us further troubleshoot.

You can find it via WooCommerce > Status. Select Get system report and then Copy for support. Once you’ve done that, you can paste it into your reply here.

If you could also provide the fatal error logs (if any) under WooCommerce > Status > Logs.

Thank you.


### WordPress Environment ###

WordPress address (URL): https://www.website.com

Site address (URL): https://www.website.com

WC Version: 7.5.1

REST API Version: ? 7.5.1

WC Blocks Version: ? 9.6.6

Action Scheduler Version: ? 3.5.4

Log Directory Writable: ?

WP Version: 6.1.1

WP Multisite: –

WP Memory Limit: 768 MB

WP Debug Mode: –

WP Cron: ?

Language: en_US

External object cache: –

### Server Environment ###

Server Info: Apache

PHP Version: 7.4.33

PHP Post Max Size: 256 MB

PHP Time Limit: 0

PHP Max Input Vars: 3000

cURL Version: 7.85.0

OpenSSL/3.0.8

SUHOSIN Installed: –

MySQL Version: 5.7.39-42-log

Max Upload Size: 256 MB

Default Timezone is UTC: ?

fsockopen/cURL: ?

SoapClient: ?

DOMDocument: ?

GZip: ?

Multibyte String: ?

Remote Post: ?

Remote Get: ?

### Database ###

WC Database Version: 7.5.1

WC Database Prefix: pe_

Total Database Size: 196.42MB

Database Data Size: 128.65MB

Database Index Size: 67.77MB

pe_woocommerce_sessions: Data: 4.02MB + Index: 0.14MB + Engine InnoDB

pe_woocommerce_api_keys: Data: 0.02MB + Index: 0.03MB + Engine InnoDB

pe_woocommerce_attribute_taxonomies: Data: 0.02MB + Index: 0.02MB + Engine InnoDB

pe_woocommerce_downloadable_product_permissions: Data: 0.02MB + Index: 0.06MB + Engine InnoDB

pe_woocommerce_order_items: Data: 0.50MB + Index: 0.16MB + Engine InnoDB

pe_woocommerce_order_itemmeta: Data: 6.52MB + Index: 6.03MB + Engine InnoDB

pe_woocommerce_tax_rates: Data: 0.02MB + Index: 0.06MB + Engine InnoDB

pe_woocommerce_tax_rate_locations: Data: 0.02MB + Index: 0.03MB + Engine InnoDB

pe_woocommerce_shipping_zones: Data: 0.02MB + Index: 0.00MB + Engine InnoDB

pe_woocommerce_shipping_zone_locations: Data: 0.02MB + Index: 0.03MB + Engine InnoDB

pe_woocommerce_shipping_zone_methods: Data: 0.02MB + Index: 0.00MB + Engine InnoDB

pe_woocommerce_payment_tokens: Data: 0.02MB + Index: 0.02MB + Engine InnoDB

pe_woocommerce_payment_tokenmeta: Data: 0.02MB + Index: 0.03MB + Engine InnoDB

pe_woocommerce_log: Data: 0.02MB + Index: 0.02MB + Engine InnoDB

pe_actionscheduler_actions: Data: 2.34MB + Index: 2.14MB + Engine InnoDB

pe_actionscheduler_claims: Data: 0.02MB + Index: 0.02MB + Engine InnoDB

pe_actionscheduler_groups: Data: 0.02MB + Index: 0.02MB + Engine InnoDB

pe_actionscheduler_logs: Data: 2.39MB + Index: 1.92MB + Engine InnoDB

pe_cartflows_ca_cart_abandonment: Data: 1.52MB + Index: 0.06MB + Engine InnoDB

pe_cartflows_ca_email_history: Data: 0.17MB + Index: 0.17MB + Engine InnoDB

pe_cartflows_ca_email_templates: Data: 0.02MB + Index: 0.00MB + Engine InnoDB

pe_cartflows_ca_email_templates_meta: Data: 0.02MB + Index: 0.02MB + Engine InnoDB

pe_commentmeta: Data: 0.02MB + Index: 0.03MB + Engine InnoDB

pe_comments: Data: 3.52MB + Index: 1.39MB + Engine InnoDB

pe_e_events: Data: 0.02MB + Index: 0.02MB + Engine InnoDB

pe_e_notes: Data: 0.02MB + Index: 0.17MB + Engine InnoDB

pe_e_notes_users_relations: Data: 0.02MB + Index: 0.05MB + Engine InnoDB

pe_e_submissions: Data: 0.02MB + Index: 0.27MB + Engine InnoDB

pe_e_submissions_actions_log: Data: 0.02MB + Index: 0.11MB + Engine InnoDB

pe_e_submissions_values: Data: 0.02MB + Index: 0.03MB + Engine InnoDB

pe_failed_jobs: Data: 0.02MB + Index: 0.00MB + Engine InnoDB

pe_jet_post_types: Data: 0.02MB + Index: 0.00MB + Engine InnoDB

pe_jet_smart_filters_indexer: Data: 0.16MB + Index: 0.00MB + Engine InnoDB

pe_jet_taxonomies: Data: 0.02MB + Index: 0.00MB + Engine InnoDB

pe_layerslider: Data: 0.02MB + Index: 0.00MB + Engine InnoDB

pe_layerslider_revisions: Data: 0.02MB + Index: 0.00MB + Engine InnoDB

pe_links: Data: 0.02MB + Index: 0.02MB + Engine InnoDB

pe_mailchimp_carts: Data: 0.02MB + Index: 0.00MB + Engine InnoDB

pe_mailchimp_jobs: Data: 0.02MB + Index: 0.00MB + Engine InnoDB

pe_options: Data: 11.50MB + Index: 1.53MB + Engine InnoDB

pe_postexpirator_debug: Data: 0.02MB + Index: 0.00MB + Engine InnoDB

pe_postmeta: Data: 39.56MB + Index: 31.11MB + Engine InnoDB

pe_posts: Data: 7.52MB + Index: 3.69MB + Engine InnoDB

pe_queue: Data: 0.02MB + Index: 0.00MB + Engine InnoDB

pe_revslider_css: Data: 0.13MB + Index: 0.00MB + Engine InnoDB

pe_revslider_css_bkp: Data: 0.13MB + Index: 0.00MB + Engine InnoDB

pe_revslider_layer_animations: Data: 0.02MB + Index: 0.00MB + Engine InnoDB

pe_revslider_layer_animations_bkp: Data: 0.02MB + Index: 0.00MB + Engine InnoDB

pe_revslider_navigations: Data: 0.02MB + Index: 0.00MB + Engine InnoDB

pe_revslider_navigations_bkp: Data: 0.02MB + Index: 0.00MB + Engine InnoDB

pe_revslider_sliders: Data: 0.02MB + Index: 0.00MB + Engine InnoDB

pe_revslider_sliders_bkp: Data: 0.03MB + Index: 0.00MB + Engine InnoDB

pe_revslider_slides: Data: 0.02MB + Index: 0.00MB + Engine InnoDB

pe_revslider_slides_bkp: Data: 0.02MB + Index: 0.00MB + Engine InnoDB

pe_revslider_static_slides: Data: 0.02MB + Index: 0.00MB + Engine InnoDB

pe_revslider_static_slides_bkp: Data: 0.02MB + Index: 0.00MB + Engine InnoDB

pe_sgs_log_events: Data: 7.02MB + Index: 0.00MB + Engine InnoDB

pe_sgs_log_visitors: Data: 6.52MB + Index: 0.00MB + Engine InnoDB

pe_storeabill_documentmeta: Data: 7.52MB + Index: 6.03MB + Engine InnoDB

pe_storeabill_documents: Data: 0.39MB + Index: 0.25MB + Engine InnoDB

pe_storeabill_document_itemmeta: Data: 6.52MB + Index: 6.03MB + Engine InnoDB

pe_storeabill_document_items: Data: 1.52MB + Index: 0.47MB + Engine InnoDB

pe_storeabill_document_noticemeta: Data: 0.02MB + Index: 0.03MB + Engine InnoDB

pe_storeabill_document_notices: Data: 0.45MB + Index: 0.11MB + Engine InnoDB

pe_storeabill_journals: Data: 0.02MB + Index: 0.02MB + Engine InnoDB

pe_termmeta: Data: 0.05MB + Index: 0.03MB + Engine InnoDB

pe_terms: Data: 0.08MB + Index: 0.09MB + Engine InnoDB

pe_term_relationships: Data: 1.52MB + Index: 0.52MB + Engine InnoDB

pe_term_taxonomy: Data: 0.09MB + Index: 0.09MB + Engine InnoDB

pe_tm_taskmeta: Data: 0.02MB + Index: 0.03MB + Engine InnoDB

pe_tm_tasks: Data: 0.02MB + Index: 0.02MB + Engine InnoDB

pe_usermeta: Data: 1.52MB + Index: 0.73MB + Engine InnoDB

pe_users: Data: 0.09MB + Index: 0.05MB + Engine InnoDB

pe_wc_admin_notes: Data: 0.02MB + Index: 0.00MB + Engine InnoDB

pe_wc_admin_note_actions: Data: 0.02MB + Index: 0.02MB + Engine InnoDB

pe_wc_category_lookup: Data: 0.02MB + Index: 0.00MB + Engine InnoDB

pe_wc_customer_lookup: Data: 0.20MB + Index: 0.14MB + Engine InnoDB

pe_wc_download_log: Data: 0.02MB + Index: 0.03MB + Engine InnoDB

pe_wc_order_coupon_lookup: Data: 0.02MB + Index: 0.03MB + Engine InnoDB

pe_wc_order_product_lookup: Data: 0.30MB + Index: 0.30MB + Engine InnoDB

pe_wc_order_stats: Data: 0.28MB + Index: 0.20MB + Engine InnoDB

pe_wc_order_tax_lookup: Data: 0.17MB + Index: 0.14MB + Engine InnoDB

pe_wc_product_attributes_lookup: Data: 0.02MB + Index: 0.02MB + Engine InnoDB

pe_wc_product_download_directories: Data: 0.02MB + Index: 0.02MB + Engine InnoDB

pe_wc_product_meta_lookup: Data: 0.50MB + Index: 0.69MB + Engine InnoDB

pe_wc_rate_limits: Data: 0.02MB + Index: 0.02MB + Engine InnoDB

pe_wc_reserved_stock: Data: 0.02MB + Index: 0.00MB + Engine InnoDB

pe_wc_tax_rate_classes: Data: 0.02MB + Index: 0.02MB + Engine InnoDB

pe_wc_webhooks: Data: 0.02MB + Index: 0.02MB + Engine InnoDB

pe_wc_zapier_history: Data: 0.05MB + Index: 0.00MB + Engine InnoDB

pe_woocommerce_gzd_dhl_im_products: Data: 0.02MB + Index: 0.03MB + Engine InnoDB

pe_woocommerce_gzd_dhl_im_product_services: Data: 0.02MB + Index: 0.03MB + Engine InnoDB

pe_woocommerce_gzd_dhl_labelmeta: Data: 0.02MB + Index: 0.03MB + Engine InnoDB

pe_woocommerce_gzd_dhl_labels: Data: 0.02MB + Index: 0.03MB + Engine InnoDB

pe_woocommerce_gzd_packaging: Data: 0.02MB + Index: 0.00MB + Engine InnoDB

pe_woocommerce_gzd_packagingmeta: Data: 0.02MB + Index: 0.03MB + Engine InnoDB

pe_woocommerce_gzd_shipmentmeta: Data: 0.02MB + Index: 0.03MB + Engine InnoDB

pe_woocommerce_gzd_shipments: Data: 0.02MB + Index: 0.05MB + Engine InnoDB

pe_woocommerce_gzd_shipment_itemmeta: Data: 0.02MB + Index: 0.03MB + Engine InnoDB

pe_woocommerce_gzd_shipment_items: Data: 0.02MB + Index: 0.06MB + Engine InnoDB

pe_woocommerce_gzd_shipment_labelmeta: Data: 0.02MB + Index: 0.03MB + Engine InnoDB

pe_woocommerce_gzd_shipment_labels: Data: 0.02MB + Index: 0.03MB + Engine InnoDB

pe_woocommerce_gzd_shipping_provider: Data: 0.02MB + Index: 0.02MB + Engine InnoDB

pe_woocommerce_gzd_shipping_providermeta: Data: 0.02MB + Index: 0.03MB + Engine InnoDB

pe_woo_add_events: Data: 0.05MB + Index: 0.00MB + Engine InnoDB

pe_woo_add_product: Data: 0.17MB + Index: 0.00MB + Engine InnoDB

pe_wpmailsmtp_debug_events: Data: 0.02MB + Index: 0.00MB + Engine InnoDB

pe_wpmailsmtp_emails_log: Data: 9.52MB + Index: 1.66MB + Engine InnoDB

pe_wpmailsmtp_tasks_meta: Data: 0.02MB + Index: 0.00MB + Engine InnoDB

pe_yith_wcwl: Data: 0.02MB + Index: 0.02MB + Engine InnoDB

pe_yith_wcwl_lists: Data: 0.02MB + Index: 0.06MB + Engine InnoDB

pe_yoast_seo_links: Data: 0.11MB + Index: 0.05MB + Engine InnoDB

pe_yoast_seo_meta: Data: 2.52MB + Index: 0.00MB + Engine InnoDB

### Post Type Counts ###

attachment: 382

cartflows_flow: 1

cartflows_step: 2

custom_css: 1

document_template: 4

e-landing-page: 2

elementor_library: 31

invoice: 46

jet-engine: 1

jet-menu: 1

jet-popup: 3

jet-smart-filters: 14

jet-woo-builder: 7

nav_menu_item: 21

page: 16

post: 2

product: 1903

product_variation: 10140

revision: 13

shop_coupon: 32

shop_order: 2194

shop_order_refund: 95

wp_global_styles: 1

### Security ###

Secure connection (HTTPS): ?

Hide errors from visitors: ?

### Active Plugins (38) ###

ManageWP - Worker: by GoDaddy – 4.9.16

Advanced Custom Fields PRO: by WP Engine – 6.0.7

Advanced Custom Fields: by WP Engine – 6.0.7

CartFlows: by CartFlows Inc – 1.11.9

Cost of Goods for WooCommerce: by WPFactory – 2.9.2

Joinchat: by Creame – 4.5.19

Custom Emails for WooCommerce Pro: by WPFactory – 1.7.0

GTM4WP: by Thomas Geiger – 1.16.2

Elementor Pro: by Elementor.com – 3.11.7

Elementor: by Elementor.com – 3.11.5

JetElements For Elementor: by Crocoblock – 2.6.9

JetEngine: by Crocoblock – 3.1.2

JetPopup: by Crocoblock – 2.0.0

JetSmartFilters: by Crocoblock – 3.0.4

JetTabs For Elementor: by Crocoblock – 2.1.21

JetTricks: by Crocoblock – 1.4.3

JetWooBuilder For Elementor: by Crocoblock – 2.1.4

Joinchat Omnichannel: by Creame – 2.0.10

Jupiter X Core: by Artbees – 3.0.0

PublishPress Future: by PublishPress – 2.9.2

SiteGround Security: by SiteGround – 1.4.1

WooCommerce Side Cart: by XootiX – 2.1

Todays Orders: by Harry Fesenmayr – 1.1

vendidero Helper: by vendidero – 2.1.6

Woo Bulk Products: by Hassan Ali – 1.0.0

WooCommerce Cart Abandonment Recovery: by CartFlows Inc – 1.2.23

WPC Product Timer for WooCommerce (Premium): by WPClever.net – 1.3.2.2

WP Sheet Editor - WooCommerce Products (Premium): by WP Sheet Editor – 1.8.1

WooCommerce Stripe Gateway: by WooCommerce – 7.2.0

Germanized for WooCommerce Pro: by vendidero – 3.6.8

Germanized for WooCommerce: by vendidero – 3.12.1

WooCommerce Zapier: by OM4 Software – 2.3.1

WooCommerce: by Automattic – 7.5.1

Yoast SEO Premium: by Team Yoast – 13.1

WP Mail SMTP Pro: by WPForms – 3.5.2

WP-Optimize - Clean, Compress, Cache: by David Anderson

Ruhani Rabin

Team Updraft – 3.2.13

WP Rollback: by GiveWP.com – 1.7.3

WPC Variations Table for WooCommerce (Premium): by WPClever – 3.4.1

### Inactive Plugins (16) ###

All-in-One WP Migration: by ServMask – 7.72

AppMySite: by AppMySite – 3.9.1

Customizer Export/Import: by The Beaver Builder Team – 0.9.5

Display Face Value of Products: by Harry Fesenmayr – 1.0.0

JetBlog For Elementor: by Crocoblock – 2.3.1

JetMenu: by Crocoblock – 2.2.4

JSM's Show Post Metadata: by JS Morisset – 3.0.11

Mailchimp for WooCommerce: by Mailchimp – 2.8.1

Raven: by Artbees – 1.11.0

Server Info: by Usman Ali Qureshi – 2.5.3

Side Cart WooCommerce: by XootiX – 2.1

SiteGround Optimizer: by SiteGround – 7.3.1

WooCommerce Admin: by WooCommerce – 3.3.2

WooCommerce Google Analytics Integration: by WooCommerce – 1.6.2

WooCommerce Out of Stock Message: by Kharis Sulistiyono – 1.0

WP Mail SMTP: by WPForms – 3.7.0

### Must Use Plugins (1) ###

ManageWP - Worker Loader: by GoDaddy – 1.0.0

### Settings ###

API Enabled: –

Force SSL: –

Currency: EUR (€)

Currency Position: right_space

Thousand Separator: .

Decimal Separator: ,

Number of Decimals: 2

Taxonomies: Product Types: external (external)

grouped (grouped)

simple (simple)

variable (variable)

Taxonomies: Product Visibility: exclude-from-catalog (exclude-from-catalog)

exclude-from-search (exclude-from-search)

featured (featured)

outofstock (outofstock)

rated-1 (rated-1)

rated-2 (rated-2)

rated-3 (rated-3)

rated-4 (rated-4)

rated-5 (rated-5)

Connected to WooCommerce.com: –

Enforce Approved Product Download Directories: –

Order datastore: WC_Order_Data_Store_CPT

### WC Pages ###

Shop base: #791 - /events/

Cart: #792 - /cart/

Checkout: #793 - /checkout/

My account: #794 - /my-account/

Terms and conditions: #1141 - /terms/

### Theme ###

Name: JupiterX Child

Version: 1.0.0

Author URL: https://jupiterx.com

Child Theme: ?

Parent Theme Name: JupiterX

Parent Theme Version: 3.0.0

Parent Theme Author URL: https://artbees.net/

WooCommerce Support: ?

### Templates ###

Overrides: jupiterx/lib/templates/woocommerce/cart/cart.php

jupiterx/lib/templates/woocommerce/checkout/thankyou.php

jupiterx/lib/templates/woocommerce/content-product.php

jupiterx/lib/templates/woocommerce/loop/rating.php

jupiterx/lib/templates/woocommerce/order/order-details-item.php

jupiterx/lib/templates/woocommerce/single-product/add-to-cart/grouped.php

jupiterx/lib/templates/woocommerce/single-product/add-to-cart/simple.php

jupiterx/lib/templates/woocommerce/single-product/add-to-cart/variable.php

jupiterx/lib/templates/woocommerce/single-product/add-to-cart/variation-add-to-cart-button.php

jupiterx/lib/templates/woocommerce/single-product/meta.php

../wp-content/plugins/jet-woo-builder/templates/woocommerce/content-product_cat.php

### Admin ###

Enabled Features: activity-panels

analytics

coupons

customer-effort-score-tracks

import-products-task

experimental-fashion-sample-products

shipping-smart-defaults

shipping-setting-tour

homescreen

marketing

multichannel-marketing

mobile-app-banner

navigation

onboarding

onboarding-tasks

remote-inbox-notifications

remote-free-extensions

payment-gateway-suggestions

shipping-label-banner

subscriptions

store-alerts

transient-notices

woo-mobile-welcome

wc-pay-promotion

wc-pay-welcome-page

Disabled Features: minified-js

new-product-management-experience

product-variation-management

settings

Daily Cron: ? Next scheduled: 2023-03-25 15:32:14 +01:00

Options: ?

Notes: 7

Onboarding: completed

### Action Scheduler ###

Complete: 6,917

Oldest: 2023-02-22 12:42:27 +0100

Newest: 2023-03-25 12:21:46 +0100

Failed: 39

Oldest: 2020-07-22 00:01:51 +0200

Newest: 2023-03-17 22:11:13 +0100

Pending: 8

Oldest: 2023-03-25 22:13:44 +0100

Newest: 2023-03-31 11:09:49 +0200

### WooCommerce Zapier ###

Database Version: ? 14

Detailed Logging Enabled: No

Legacy Mode Disabled: ? Yes

SSL: ? Yes

REST API Authentication Key(s): ? 45

Task History Record Count: ? 191

Webhook #19: WooCommerce Zapier

- Status: active

- Trigger: order.paid

- Delivery Count: 72

Deleted Webhook Delivery Count: 118

Order Action Count: 1

### Status report information ###

Generated at: 2023-03-25 12:25:33 +01:00

Hi @harryf98

Thanks for reaching out!

I understand that some new order messages on your site are rejected with “550 Subject contains invalid characters” in them, correct?

Custom Emails for WooCommerce Pro: by WPFactory – 1.7.0

Checking your site’s System Status Report above, I can see that you have this plugin enabled on your site. Can you please try to disable this plugin, create a test order and see if this works?

Otherwise, please try to switch to the default Storefront theme and only WooCommerce plugin is enabled, create a test order again and see if this resolves the issue.

If so, then this kind of problem is usually caused by your theme or a third-party plugin present on your site. We can run a conflict test to verify this. I’d recommend cloning your site to a staging environment and performing the tests described on this guide without modifying your live site or impacting customers. Many hosts provide staging facilities, so it’s worth checking in with them. It’s also possible to do it using the free WP Staging plugin.

If this was caused by a third-party plugin present on your site, it would be best to reach out to the developers for further assistance here.

If this did not resolve the issue, please provide the fatal error logs (if any) under WooCommerce > Status > Logs.

You could copy and paste your reply here or paste it via https://gist.github.com/ and send the link here.

Let us know how it goes!

Hi @harryf98

We haven’t heard back from you in a while, so I’m going to mark this as resolved – we’ll be here if you need any further help with this.

Cheers!