I have 2 years old installation of Odoo 12. Today I noticed that for quite some time server is unable to send emails becuase of an error:
Mail delivery failed via SMTP server 'None'. SMTPSenderRefused: 553 5.7.1 bounce+2609-maintenance.request-540@xxxxx.com: Sender addres rejected: not owned by user platforma@amister.pl tid:[2529500] bounce+2609-maintenance.request-540@xxxxxx.com
There wasn't any changes that I know of. It suddenly stopped working.
- I have outgoing server configured correctly
- Connection test says that everything is fine
- Email has my outgoing server specified
- I tried resending this email and the same error occured
- I installed ` mail_outbound_static ` but didn't work
What can I do now?