I am suddenly now unable to send emails and getting the following error message;
Server error: '550 5.7.1 <email@example.com>... Relaying denied. Proper authentication required.'
Incoming Email Server set at: pop.tpg.com.au
Outgoing Email Server set at: firstname.lastname@example.org
Incoming Server POP3: 110
Outgoing Server SMTP: 25
No Authentication Required Selected:
Please help as it is becoming very frustrating and have never had this problem before now.
Hi @amhutchi . Can you try enabling Authentication.
Do you know if this problem occurred around the time your router's ip address might have changed?
The two mail servers are mail.tpg.com.au .
You might like to check out use of encryption for sending and receiving mail.
Thanks for your quick reply.
Have set incoming and outgoing server to: mail.tpg.com.au
Have now set to require Authentication.
Ports remain as where:
POP3 to 110
SMTP to 25
And Encrypted Connection to: TLS
And now seems to be working for email send.
It appeared to start after doing a computer re-start. I connect currently though a third party secure wifi service or via phone 4G by hot spotting. Will keep an eye on it and see how it now goes. Couldn't undertsand what had changed.
Regards & Thanks
@amhutchi . Regarding encryption, ports 25 and 587 (SMTP) and port 110 (POP3) support STARTTLS depending on version of Outlook. Port 465 (SMTP) and port 995 (POP3) use SSL/TLS.
Regarding authentication, I had to enable it after a disconnection. After another disconnection, I found that it was not needed. In some way, it depends on ip address.