SMTP settings are checked (with user@domain as login) and Track replies using VERP in Reply-To header is disabled (it worked before).
How come a generated email adress name is used as login, thus preventing CiviMAIL to send a test mail?
Drupal 7.61 CiviCRM 4.7.30

Jan 09 07:00:10 [info] Ignoring exception thrown by nullHandler:
10005, Failed to add recipient: user@domain
[SMTP: Invalid response code received from SMTP server while sending email.
This is often caused by a misconfiguration in Outbound Email settings.
Please verify the settings at
Administer CiviCRM >> Global Settings >> Outbound Email (SMTP).
(code: 550, response: Verification failed for
< b.1223.8100.d34261f00e3242ab@domain>
This email address does not exist. Dit e-mail adres bestaat niet. Sender verify failed)]

  • This looks like a change in your SMTP server. I would show this error to whomever runs the mail server, they probably made a recent change that could cause this. Jan 10, 2019 at 0:40

1 Answer 1


My comment above notwithstanding, there is a possibility that this isn't a mail server issue.

If you recently upgraded to a newer version of PHP, you may have gone from a version that uses mcrypt to encrypt the outgoing mail password to one that doesn't. To fix this, go to Administer menu » System Settings » Outbound Mail and re-enter your SMTP password and save.

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