SMTP Relay only for localhost requests without authentication

Question asked by Andrea Pacini - 4/3/2021 at 3:22 AM

Answered

Is it possibile to set the SMTP Relay of SmarterMail to work without authentication only for websites on the server?

5 Replies

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Sébastien Riccio Replied

4/3/2021 at 5:40 AM

Hello,

I guess you can whitelist localhost (127.0.0.1).

In Settings > Security > Whitelist > and add 127.0.0.1 with SMTP SMTP and SMTP Auth Bypass options.

Kind regards.

Sébastien Riccio System & Network Admin https://swisscenter.com

Andrea Pacini Replied

4/4/2021 at 10:52 AM

Thanks for your reply Sébastien

I tried but if I try to send an e-mail from a website without smtp authentication it still give me error.

Here is the whitelist configuration I've made.

Have you any suggestion to allow only websites on server to send mail without smtp authentication?

Thanks for your help.

Sébastien Riccio Replied

4/4/2021 at 11:22 AM

Hello,

Does it return an error message ? Do you send the message from the website on port 25 or 587 ?

Please set SmarterMail SMTP log to detailed (in troubleshooting) and try again, then check the SMTP log to find the failing transaction, it might contain some info about why it fails.

Kind regards

Sébastien Riccio System & Network Admin https://swisscenter.com

Andrea Pacini Replied

4/4/2021 at 1:58 PM

Marked As Answer

I got the problem.

I had to set the IP of the server in the whitelist. The 127.0.0.1 wasn't enough to allow websites to send e-mail throw mail server without authentication.

Now it's working.

Thank you very much for your help.

Kyle Kerst Replied

4/6/2021 at 3:24 PM

Employee Post

@Andrea - I am glad to hear you were able to resolve the issue! I do recommend removing the whitelisting for 127.0.0.1 as this can allow anything installed on the server (localhost) to send email without authenticating beforehand.

Kyle Kerst Lead Internal Network/System Administrator SmarterTools Inc. smartertools.com

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