Weirdness with smtp restrictions

[David P.]

I remember reading something where there was a bug with smtp restrictions and sending to gmail where you get the below bounce back, until you toggled smtp restrictions off and back on. I am still seeing that issue and for one of our clients it seems to be persistent sending to a g-suite domain. Any thoughts?

Here is what I found that seemed to work everytime, but it seem like after an update I have to toggle the setting again.

Please turn on SMTP Authentication in your mail client errors

All of a sudden customers on different servers get the following error: SMTP error from remote mail server after RCPT TO:: 550-Please turn on SMTP Authentication in your mail client, or login to the 550-IMAP/POP3 server before sending your message. All have SMTP Authentication turned...

forums.cpanel.net

SMTP error from remote mail server after RCPT TO:<gsuite or gmail e-mail address>:
550-Please turn on SMTP Authentication in your mail client.
550-<server FQDN> [<server ip address>]:60244 is not permitted to
550 relay through this server without authentication.

 

[cPRex]

Hey there! Just so I'm clear, you change the setting in your mail client, but then after a cPanel update you have to re-toggle the setting on the mail client side?

If that is the case, can you reproduce this manually with the "/scripts/upcp --force" command?