Hi. All emails sent to my host managed by plesk suddenly are rejected. This is a sample message
Technical details of permanent failure:
Google tried to deliver your message, but it was rejected by the server for the recipient domain tropicinvoice.com by mail.tropicinvoice.com. [138.128.173.42].
The error that the other server returned was:
550 This mail server requires authentication (1) when attempting to...
Emails sent to host rejected (550)
Technical details of permanent failure:
Google tried to deliver your message, but it was rejected by the server for the recipient domain tropicinvoice.com by mail.tropicinvoice.com. [138.128.173.42].
The error that the other server returned was:
550 This mail server requires authentication (1) when attempting to...
Emails sent to host rejected (550)