a few of emails being sent account getting rejected. these error messages:
- server response: 550 550 requested action not taken: mailbox unavailable invalid dns mx or a/aaaa resource record
- from: domain invalid. please provide valid from: ib506 http://x.co/srbounce
is issue on end or (the receivers) end? how should fix problem?
you set mx record domain not subdomain email being sent. need set mx record subdomain also.
