emails sent to me not being delivered.

rbulph

A friend of mine has twice reported problems emailing me. When he tries he gets a delivery report like this:

"Reporting-MTA: dns; omr-a012e.mx.aol.com
X-Outbound-Mail-Relay-Queue-ID: 7C06A3800087
X-Outbound-Mail-Relay-Sender: rfc822; xxxxxxxxxx@aol.com
Arrival-Date: Sun, 26 Jun 2016 06:13:50 -0400 (EDT)

Final-Recipient: rfc822; yyyyyy@blueyonder.co.uk
Original-Recipient: rfc822;yyyyyy@blueyonder.co.uk
Action: failed
Status: 4.0.0
Remote-MTA: dns; mx.mnd.ukmail.iss.as9143.net
Diagnostic-Code: smtp; 421 mx2.mnd.ukmail.iss.as9143.net bizsmtp Too many
simultaneous sessions"

It's a bit of a concern because there's a chance other people are finding the same problem and not trying again, but just giving up. I don't think this is anything to do with spam filters. Is there anything I can do about this? Do you think the problem is at my end or my friend's end?

Thanks

Neil_Jones

Error 421 is a mail error is typically a temporary routing issue on the receiving mail server's end. These should usually be resolved automatically.

What that means is: There is a temporary issue with the servers providing the email. This should fix itself in due course. If it's still the same after, say, 24 hours or so, give your email provider a quick call.

rbulph

Thanks. It only happens sporadically but one email that he says he sent me never appeared at all and nor did he get an undelivered message. It's also strange that only this individual is reporting it. If it happens again I'll contact my email provider.

Heedtheadvice

It's very annoying having a problem that you are not aware of!
But for the info you would probably not even know about it so, not sure of this will work with all email providers, but try sending yourself a test email periodically.

grumpycrab

If Blueyonder comes under Virgin these days then "Too many
simultaneous sessions" is Virgin's attempt at delaying who it thinks is a spammer. The message delivery takes 2 or 3 days.

Get the sender to try again with only a single recipient.

https://community.virginmedia.com/t5/Email/Email-rejection-error-quot-too-many-simultaneous-sessions-quot/m-p/3076956