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Email Suddenly Now Not Sending in Outlook 2013

amhutchi
Level 2

I am suddenly now unable to send emails and getting the following error message;

 

            Server error: '550 5.7.1 <xxxxxx@xxxxxxxxxxxxx.com.au>... Relaying denied. Proper authentication required.'

 

Incoming Email Server set at: pop.tpg.com.au

 

Outgoing Email Server set at: smpt@tpg.com.au

 

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.

3 REPLIES 3
david64
Level 12

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.

amhutchi
Level 2

Hi David,

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

 

Allan H

david64
Level 12

@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.