Weirdness with smtp restrictions

David P.

Active Member
May 19, 2019
cPanel Access Level
Root Administrator
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.

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.


Jurassic Moderator
Staff member
Oct 19, 2014
cPanel Access Level
Root Administrator
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?