Telkom Error 421 cannot connect to SMTP server

NU68616Toy

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Joined
Nov 13, 2023
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I was previously on ADSL and have switched to Telkom DWR-957M LTE router. I Installed and set it up without any issues but now I find that I have a problem with the email set up. I can receive but sending an email fails. I do not want to use IMAP only POP3.
Please note:-
I have a Vodacom router as well and if I connect to the Vodacom Wi-Fi, my both my Vodacom and Telkom emails send and receive perfectly.

I have tried changing smtp to :- smtp.telkomsa.net, smtp.saix.net, smtp.telkomsa.net, smtp.dsl.telkomsa.net. None of these work. I tried changing Port from 25 to 465.
None worked. I also tried disabling my VPN and Malewarebytes .
Copy of send receive error below. What else can I try because this is driving me around the bend.

im‫age 2.png
 

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