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.

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.

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

@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.