Yahoo, Hotmail delivery problems

mpdillon · Post by **mpdillon** » Fri Oct 10, 2008 9:49 am

I have written a VB.Net app in Visual Studio 2008. I am using SMTP to send mail through my ME server. Mail that is sent to other users outside the mail enable server is received. However, if the account is a Yahoo or Hotmail account, the mail is never delivered. What is causing this behavior and how do I get mail delivered to Hotmail and Yahoo?
thanks,
pat

MartynK · Post by **MartynK** » Sat Oct 11, 2008 12:31 am

Whats in the SMTP log files ?

mpdillon · Post by **mpdillon** » Sat Oct 11, 2008 11:29 am

Thank you. In the log Yahoo listed a web site to visit to get my domain listed as acceptable. I will send email to hotmail and aol to see if they have similar services. Other than Yahoo, Hotmail and AOL are there any other Popular services I should worry about? (i.e. gmail etc.)

MartynK · Post by **MartynK** » Sat Oct 11, 2008 1:35 pm

To be honest I have never had issues, but if you do and don't have any luck with these providers as they are not the easiest to solve, just smarthost those domains via your ISP if you can.

As for others, gmail, yahoo and hotmail, being some of the worst offenders are also the worst for blocking email.

johnd34 · Post by **johnd34** » Sun Mar 29, 2009 4:03 pm

Does a normal test message get to them.

Such services love making up rules and blacklisting,
So try a simple message and see if your IP or server is blacklisted.

mpdillon · Post by **mpdillon** » Mon Mar 30, 2009 1:34 am

John,
Thanks for the reply but no even a short test message sent from Outlook does not go through.
I was reading on Fri about the need for a Reverse DNS lookup. I have a static IP with Verizon. I do not know what a reverse DNS lookup is but I will contact Verizon and hope that they can help.
pat

johnd34 · Post by **johnd34** » Mon Mar 30, 2009 8:45 am

A working reverse DNS is expected.
Ask your hosting provider to set this up for you and then mae sure your dsn points to it in the other direction.

You may also want to look at setting up domainkeys and SPF

Also, look up the main domain blocking lists to make sure your IP has not been used before and is blocked.

Of course if you are using a server on a broadband or dial-up connection then you are likely to be in the range blacklists.