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I have some problems with my postfix setup. We send newsletter regulaly to our customers once or twice a week. and we have expierenced that many customers do not get their emails, it's simply because our domain has been listed as spammer in their spamfilter.

I've asked one of our customers to check what's the reason that our emails come directly in their spamfilter. he said "the problem is, that we are sending emails from a server which is not registered to be a valid exchanger for domain name [ourdoman].com".

can anyone explain to me what does this mean?

the company use MS exchange as our main mail server. and we use linux / postfix / php to send newsletters. both ms exhcange and postfix share the same domain name.

Zhenyu
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3 Answers3

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Maybe you have not set a valid ptr-record for your mailserver. the myhostname entry in main.cf should be the same as your ptr record for your mailserver ip. Also check if you have a SPF-record for your domain. If so check if you have listed your postfix mailserver in it.

this statement

"the problem is, that we are sending emails from a server which is not registered to be a valid exchanger for domain name [ourdoman].com"

is quite wrong. A mailserver does not have to be the MX in order to be able to send email for that domain.

lsmooth
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ah83
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You need to form correctly the headers and try good words in the content of your messages.

Aymane Shuichi
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If that's truly the issue then you need to make a change to the MX record at the DNS server(s). More info here.

ethrbunny
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