Webmail / Contact Forms 550-Please turn on SMTP Authentication in your mail client.

[SPCDEV]

As of yesterday after a cPanel update clients have been getting these errors. These are happening via webmail and contact forms on websites. Not via third-party tools such as Outlook.

ECDHE-RSA-AES256-GCM-SHA384:256 CV=no: SMTP error from remote mail server after RCPT TO:<[email protected]************>: 550-Please turn on SMTP Authentication in your mail client.\n550-****.*******web.com [**.***.**.***]:39640 is not permitted to relay\n550 through this server without authentication.

Rejected relay attempt: '**.***.**.***' From: '[email protected]********web.com' To: '[email protected]********.com'

Looks like it started right after an update. I updated and restarted my server 02-24-2022 12:40 am and the errors started happening Feb 24, 2022, 12:42:00 AM.

 

[cPRex]

Hey there! Can you check the various options here to see if any of these issues help?

https://support.cpanel.net/hc/en-us/articles/360058963474-550-Please-turn-on-SMTP-Authentication-in-your-mail-client

 

[SPCDEV]

Looks like I had to restart CSF to fix the issue. I've restarted my server before so not sure why it broke this time.

 

[cPRex]

That's definitely odd - I can't say for sure why that would be the case as we don't handle CSF on our end, but I'm glad you got that resolved!

 

[SPCDEV]

I also turned off FKA SMTP Tweak and turned it back on so could be that as well. Anyways, it works not thank you.