ElasticEmail – Only sending via fallback works

I’m noticing a strange occurrence when sending out emails with ElasticEmail.

I have smtp25.elasticemail.com set as my primary and fallback. The primary always fails with the message:

‘[email protected]’ appears to be a DNS hostname but cannot match against hostname schema for TLD ‘com’, ‘[email protected]’ does not appear to be a valid URI hostname, ‘[email protected]’ does not appear to be a valid local network name

Even though they both share the same login/password, the fallback sends it out OK.

According to https://elasticemail.com/account/#/settings/smtp, the primary should be [email protected], but setting that as either primary or the fallback doesn’t send out emails either.

Under the connectivity test, [email protected]:25/465/587 has No under Service Available. Same with [email protected].

Testing out the new PHPmailer feature doesn’t fix it as well.