When receiving mail, Postfix logs the client-provided username, authentication method, and sender address

[f***@gmail.com]

When receiving mail, Postfix logs the client-provided username, authentication method, and sender address to the maillog file, and additionally grants mail access via the permit_sasl_authenticated UCE restriction.can't

I don't understand this What does the client have to do with anything when postfix receives mail from let's say another smtp server, it has nothing to do with a mail client does it? To me the client, in my case, is Claws Mail which I used to gather mail from my postfix server by authenticating using, in my case, Dovecot

[d***@gmail.com]

Post by f***@gmail.com
When receiving mail, Postfix logs the client-provided username, authentication method, and sender address to the maillog file, and additionally grants mail access via the permit_sasl_authenticated UCE restriction.can't
I don't understand this What does the client have to do with anything when postfix receives mail from let's say another smtp server, it has nothing to do with a mail client does it? To me the client, in my case, is Claws Mail which I used to gather mail from my postfix server by authenticating using, in my case, Dovecot

Hi

I am not sure I understand your question well.

When authentication is not mandatory, smtp clients can authenticate if they want to.

But there is no "store and forward" password mechanism in smtp servers so if you see a sasl authentication log in you postfix maillog file, it means the smtp client did authenticated.

Regards

Victor

[fugee ohu]

Post by d***@gmail.com

Post by f***@gmail.com
When receiving mail, Postfix logs the client-provided username, authentication method, and sender address to the maillog file, and additionally grants mail access via the permit_sasl_authenticated UCE restriction.can't
I don't understand this What does the client have to do with anything when postfix receives mail from let's say another smtp server, it has nothing to do with a mail client does it? To me the client, in my case, is Claws Mail which I used to gather mail from my postfix server by authenticating using, in my case, Dovecot

Hi
I am not sure I understand your question well.
When authentication is not mandatory, smtp clients can authenticate if they want to.
But there is no "store and forward" password mechanism in smtp servers so if you see a sasl authentication log in you postfix maillog file, it means the smtp client did authenticated.
Regards
Victor

doesn't sasl use the username and password on the server?

[d***@gmail.com]

Post by f***@gmail.com
When receiving mail, Postfix logs the client-provided username, authentication method, and sender address to the maillog file, and additionally grants mail access via the permit_sasl_authenticated UCE restriction.can't
I don't understand this What does the client have to do with anything when postfix receives mail from let's say another smtp server, it has nothing to do with a mail client does it? To me the client, in my case, is Claws Mail which I used to gather mail from my postfix server by authenticating using, in my case, Dovecot

Hi

Yes SASL sends credentials to the saslauthd deamon which sends it to an authenticate backend like LDAP. The password is often (should be) a hash and can not be used by postfix to authenticate to an other SMTP server.

Regards
Victor