Hello,

I have configured Outlook 2013 to use SMTP auth by username in UPN format, but it keeps sending local part of username to the server:

postfix/smtpd[27896]: A404B101AFA: client=server.domain.com[1.2.3.4], sasl_method=DIGEST-MD5, sasl_username=testuser

Tried the same with Thunderbird client - it worked properly:

postfix/smtpd[25408]: 317F1101AFA: client=server.domain.com[1.2.3.4], sasl_method=CRAM-MD5, sasl_username=testuser@domain.tld

Could you tell my what is the reason of such Outlook behavior?

Regards,

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Alex

Hi,

Would you please detail some information? This will help me understand the scenario better.

First, what type of account is it in Outlook?

By "I have configured Outlook 2013 to use SMTP auth by username in UPN format", would you please detail how you performed this?

Regards,

Melon Chen
TechNet Community Su