Emails not being delivered

[#1]

Quote from: Bob

... I'll take a quick look now...

OK, I've added some comments to your ticket. There's not a great deal I can ascertain from the information you've provided, however I will have somebody check our server logs for evidence of one of the emails you've reported as going missing...

[#2]

Quote from: pierre_pierre

... tried again tonight with him on the phone, he sent me one to confirm his address, got here in under two minutes, did a direct reply, not received, did a second ten minutes later, got it ok, did a third with a BCC to me, I got the BCC he got nothing

Have traced one of the emaisl you said didn't turn up. It left our network within a minute of being sent and was passed to a mail server with the IP address 195.50.106.142.
This is a BT/Yahoo! server:

~$ host 195.50.106.142
142.106.50.195.in-addr.arpa domain name pointer mta-v1.bt.mail.vip.ukl.yahoo.com

From there I cannot tell you what happened because that will have been entirely down to BT/Yahoo!

[#3]

Thank Bob, tried posting another set of headers when you posted your reply, something is stripping of info, so have also posted a screen grab

[#4]

Thanks Pierre,
Looks like the email went walkabouts after it was passed to BT/Yahoo!