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[Teneo]

For a customer of ours we are experiencing a realy strange problem ...

They send out 2 campaigns for 2 different brands , same content in the mail, same subject. Only the senders are different.
All mail arrives fine in Yahoo, all mail arrives fine in GMAIL ... but in Hotmail only the campaign from brand A is delivered, Brand B campaigns
just disappear into cyberspace.

Both sender domains have no SPF, no DKIM , they are on the same server, same DNS host, etcetera.
The campaigns are NOT delivered into Junk, they just never arrive at the recipient.

We have created 5 different Hotmail accounts, send both campaigns to the 5 test addresses. Brand A arrived 5 times in Inbox , campaign B never arrived anywhere.

In the PMTA logs we see normal delivery , returning 2.2.0 Queued for delivery from Hotmail.

Anybody any idea where to look for this problem ?

[CaLViN]

Different mailfroms ? Different ips ?

[Teneo]

Different mailfroms ? Different ips ?

Hi Calvin

They are sent over the same IP but with different MAIL FROM domains.
However , I just sent a test message with that MAIL FROM and it arrives fine 

The customer says if they send it over their own inhouse SMTP server they arrive fine which sounds realy strange to me 

[CaLViN]

It looks like the links in content are banned.Have you tested this ?

[Teneo]

It looks like the links in content are banned.Have you tested this ?

Hi , yes we did , same links in the same content , there is no difference between them.
I will double check again to make sure.

[CaLViN]

Teneo,
Have you found out something ?

[daniel]

Did you always send Campaign A before Campaign B?
Perhaps hotmail noticed the content was the same and decided to not deliver Campaign B because once Campaign A came through it appeared to be spam?