Split Mailserver Configuration, VestaCP and Office365, SMTP 550
Posted: Thu Jul 02, 2020 7:28 pm
Hi!
some of our Customers want to use a "split" Mail-Server configuration, some Mailboxes at VestaCP, few Mailboxes at Office 365.
example.com ist registered at VestaCP with Web/DNS and Mail.
MX Record Points to VestaCP. Mail in/out from VestaCP runs perfect!
Some Users from example.com use an Office 365 Account.
So for this Mailboxes we forward the Mails to the "internal" Office 395 E-Mail Adresses.
VestaCP Account [email protected] -> Forward to [email protected]
If the User send from his Office 365 Account with [email protected] as sender to [email protected] (VestaCP Mailbox without Forward)
we get an "550 5.0.350 Remote server returned an error -> 550 smtp auth required"
Because of exim config:
Which is ok, but i should recieve this Mails without be an open relay :)
The Customer _old_ Provider had the same setup, he accepted "external" Mails with the same Domain.
Similar, old Cases are:
viewtopic.php?t=11171
viewtopic.php?t=15151
My thoughts:
Domains with "Split" Setup could relay without Auth, perhaps additional with O365 Server IP Whitelist.
O365 Mails should Relay to VestaCP (i think this is not possible on o365)
Best Regards!
some of our Customers want to use a "split" Mail-Server configuration, some Mailboxes at VestaCP, few Mailboxes at Office 365.
example.com ist registered at VestaCP with Web/DNS and Mail.
MX Record Points to VestaCP. Mail in/out from VestaCP runs perfect!
Some Users from example.com use an Office 365 Account.
So for this Mailboxes we forward the Mails to the "internal" Office 395 E-Mail Adresses.
VestaCP Account [email protected] -> Forward to [email protected]
If the User send from his Office 365 Account with [email protected] as sender to [email protected] (VestaCP Mailbox without Forward)
we get an "550 5.0.350 Remote server returned an error -> 550 smtp auth required"
Because of exim config:
Code: Select all
deny message = smtp auth required
sender_domains = +local_domains
!authenticated = *
The Customer _old_ Provider had the same setup, he accepted "external" Mails with the same Domain.
Similar, old Cases are:
viewtopic.php?t=11171
viewtopic.php?t=15151
My thoughts:
Domains with "Split" Setup could relay without Auth, perhaps additional with O365 Server IP Whitelist.
O365 Mails should Relay to VestaCP (i think this is not possible on o365)
Best Regards!