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I'm trying to upgrade to PHP 7 from 5.5, but CiviCRM mailer stops working. The Send test email results in:
To verify the email settings I used Easy WP SMTP
And it is able to send a test email.
The server does not support SSL or TLS. Any ideas about what to try next?
It's likely that you've added (or removed) the php-crypt library in your PHP upgrade process. This would cause your password to be encrypted in an incompatible method. Re-enter your credentials or match your php-crypt to what it was previously.
Check this answer on the SE question SMTP connection failing problem. Seems related with your problem due to the PHP update above version 5.5.
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