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Outlook 2013 cant connect to SMTP error 421 / 0x80042109 - fixed, but uh?

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Last response: in Apps General Discussion
April 24, 2014 11:34:02 AM

I noticed I had a problem with sending mail last week, which has just been fixed by my ISP (who are not my mail provider). I can see exactly what they've done, but it doesn't make sense...! Can someone help?

I first noticed the problem last week when sending mail via Outlook, where I was getting the error mentioned in the subject line - cannot connect to SMTP / error 421 / 0x8004219. I could still receive mail without a problem. I had made no changes to the set up at all (same setup I've had for years, through multiple ISP changes), but I have changed my ISP in the last month. I hadn't sent any mail since changing broadband provider until last week.

My Mail Provider settings are:

Outgoing mail requires authentication

Incoming server - port 110
Outgoing server - port 25

I am still able to use these settings on my mobile, as long as I'm not using my home wireless / broadband to connect. If I use wireless, mail will not send.

I had run a repair on the PST file, and had played with settings in Avast - 2 potential solutions, which didn't make a difference, so I contacted my ISP today.

After a bit of investigation, she made a change to my outgoing mail server, which is now:
untick outgoing mail requires authentication

and now mail works. and I don't understand why! Surely my mail settings are governed by my mail provider, not my ISP? Otherwise they wouldn't still work on my phone?

Is my mail now being sent via Orange / EE, rather than via my mail provider??

Will my mail still work on my mobile phone if I change the outgoing server to Orange?

I'm confused!!!!!!

Can anyone help??

More about : outlook 2013 connect smtp error 421 0x80042109 fixed

Best solution

April 24, 2014 12:55:50 PM

Your provider is now requiring that all SMTP traffic on port 25 go through their servers if you are connected to their network. It's one of many anti-spam measures adopted by providers. Yours is just slow to have done so as most made the switch years ago. If your off ISP mail provider offers service on another port (usually SSL on 587) you can try setting that up.
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