Resolved send mails from non-existing account

[Tobias Janzen]

Hi,

this is my first here and i hope someone can help me.
I run plesk Version 17.8.11 on ‪Ubuntu 16.04.5 LTS‬.
Mailserver is Postfix, IMAP-/POP3-Server is Dovecot.

Thats my problem:
The account [email protected] is existing.
If i add a mailaccount on my ipad and choose e.g. the non-existing emailadress [email protected] but use jon does credentials for incoming and outgoing server, the server accepts it all and i can send emails as [email protected].

Hope someone can help me

 

[Ales]

Email spoofing is a complex issue. In general, From and Reply-to fields in email messages can be arbitrarily set and are thus easily fabricated.

If one tries to enter a completely fabricated From field, i.e. [email protected], recipient's antispam systems usually step in and flag, quarantine or delete such a spoofed message, or at least they are expected to.

There is a way to fight sending spoofed mails when using Postfix though, refer to this: Plesk Help Center: How to restrict the field "From" mismatch for emails and prevent outbound mail spoofing?

 

[Tobias Janzen]

Thx Ales,

problem is solved.