Customer’s not receiving emails after submitting form

Hi there @hemant112233,

Thanks for reaching out! Based on the error, it looks like there may be an issue with your SMTP server. For instance, in the error message you shared, it says:

STOREDRV.Storage; mailbox server is too busy; 

Failed to process message due to a transient exception with message

Cannot open mailbox. Server = BY5PR12MB4260.namprd12.prod.outlook.com,

It looks like this problem may have to do with the SMTP server you’re connecting to. It’s possible that the custom code in your functions file may be affecting it, but if that same unchanged code was working before, I would look more at the SMTP server you’re connecting to.

I hope that helps! Have a great day!

Thanks, David for the reply.

Both the things are unchanged, the concern was few users were try to spam with multiple attempts so we decided to add captcha but something did’nt worked with the email so we reverted.

Can you check if we can change something in config?

Also, can it be because of DMARC issue?

Or is it because of admin email and email used to send emails are different, please share thoughts.

Also, someone is constantly getting emails by submitting forms may be bot.

Please can you let us know what exactly is happening here with your experience after going through all these points.

Looks like a bot was setup so I changed URL and emails stopped but still not receiving emails, everything is same like before. Please let me know some suggestions to work on.

https://caproso.com/calculator-savings/

Rarely we get the above error mentioned first thread but generally we’re getting this where 737 is custom function used i.e. wp_mail.

Builderio

/home/site/wwwroot/wp-content/themes/builderio/functions.php (line: 737)

Backtrace:
[0] wp_mail called at [/home/site/wwwroot/wp-content/themes/builderio/functions.php:737]
[1] custom_contact_form_handler called at [/home/site/wwwroot/wp-includes/class-wp-hook.php:324]
[2] WP_Hook->apply_filters called at [/home/site/wwwroot/wp-includes/class-wp-hook.php:348]
[3] WP_Hook->do_action called at [/home/site/wwwroot/wp-includes/plugin.php:517]
[4] do_action called at [/home/site/wwwroot/wp-admin/admin-post.php:85]

• This reply was modified 2 months, 1 week ago by hemant112233.

Hi there @hemant112233,

I do apologize for the delay.

If your site is being targeted by spam bots, captchas can usually help. However, it is important to note how captchas work. They are intended to prevent a spam bot from submitting a form. When they work, any data the spammer tries to send will never reach WP Mail SMTP because it will be stopped at the form level.

If spam is getting through, it means the spammer is either sending the spam through some other method (perhaps another form), or they are getting through the captcha. Depending on the type of captcha you are using, this could be possible, as some captchas are much easier to avoid than others.

Try sending a test email using only WP Mail SMTP. You can use the Email Test feature in the Tools section. If that email gets through, it means the issue is likely on the form or captcha side of things.

However, if the Email Test from within WP Mail SMTP does not go through, try redoing your connection to Outlook, specifically the SMTP Password. Microsoft requires the use of App Passwords for SMTP connections, so you won’t be able to use your regular Outlook password. Instead, you’ll need to create an App Password to connect with.

We have details on how to create one here: https://wpmailsmtp.com/docs/how-to-set-up-the-other-smtp-mailer-in-wp-mail-smtp/#secure-outlook

Also, you can check your Outlook account’s Sent folder to see if emails are showing there. If they are, it means they at least made it to Outlook.

Regarding the error message you originally posted, you would need to check with Outlook to find out more about it, or install a logging plugin like WP Mail Logging to capture a copy of the email that was sent when the error occurs. There would be something about that email that Outlook isn’t accepting, and given the custom code and the spam bots, it could be either one.

I hope that helps! Have a great day!