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Not receiving all mails on the Mdaemon server

We recently started having problems with out Mdaemon server. Some mails come through, but some do not. I havent managed to find out a pattern as yet. For example,

1. We get calls from clients asking us why we havent replied to their mails when in fact we have not received it. When we ask them to forward such a message, we receive it and find that they have actually sent us the mail, but we didnt receive it. On checking the server logs, I cannot find an entry for the orignal message only the recently forwarded one.

2. A Blackberry Internet Service user sends a mail to 2 email accounts on the server. Only one receives it. When i search the logs, the entry is there, but for only one of the email accounts, the one that received it.

I wonder if the problem is with our server or at the other end. Clients say that they are not receiving any bounced back messages either. Everything was working fine on the server until a month ago when this problem was first reported. Please help
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dominicelroyfernandez
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dominicelroyfernandez
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1 Solution
 
moorhouselondonCommented:
Are you using DomainPOP, or SMTP delivery?  The rest of this assumes you are not using DomainPOP.

If you are receiving these emails via SMTP, then are you seeing them in the SMTP In log?  Make sure you are logging all SMTP activity.

If you are not seeing some of these emails in the SMTP In log, then they are not reaching your Server.  The only way you can effectively troubleshoot this problem is by asking the Sender to provide you with a comprehensive transcript of their SMTP logs for that Outbound message from their Server.
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dominicelroyfernandezAuthor Commented:
Thank you for your quick response. I am using SMTP. I have searched the logs but not found any entries for those email ids. I have asked them to check the logs from their end, but have not received any reply as yet.

There are around 30 domains hosted on this mail server and quite a few of the domains are complaining of this problem which was why I thought the problem was at my end. because all of a sudden how could lots of clients have this problem.
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moorhouselondonCommented:
Ask any sender to you who has this problem to send you an SMTP handshaking transcript.

It is easily possible that the problem is with your DNS setup.  Let's say you have multiple MX records for any one of the domains you are hosting mail for.  This intermittent failure could be due to two messages coming into your mail server at exactly the same time.  The first message gets processed by your MX record with the highest precedence (the lowest number), and that the second gets diverted to the MX record with the second highest precedence.  If you have multiple MX records, make sure they point to places you know are correct.  Sometimes ISP's offer a "Store and Forward" solution whereby if your mail server is off for any reason, the ISP will take in your emails temporarily, then forward them to you when it is ascertained your mail server is up and running again.

www.dnsstuff.com

Check your "A" records and corresponding "MX" records using DNSReport.
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dominicelroyfernandezAuthor Commented:
I found the problem. The problem was with the Antivirus and the inline Spam filter. After going through all the logs, I found that the problem started when we upgraded our Antivirus. The inline spam filter was unable to scan the message and the message was dropped. After reversing the antivirus installation it went back to normal. Thanks for all your help.
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