blocking mail for more than 3 recipients from yahoo or gmail to my mail server

[fathianf]

I have set smtpd_recipient_limit=3, smtpd_recipient_overshoot_limit=3, but it just blocks sending mail to more than 3 accounts from my server to local address, but what I want is to block mails from yahoo or gmail in thsi way, as they send mail to more than 500 users and we will get in trouble. Please let me know what should I do for blocking incoming mails.

[uxbod]

Do the 500 users exists ? Are they all within in single email or individual emails ?

[phoenix]

Originally Posted by fathianf

.. but what I want is to block mails from yahoo or gmail in thsi way, as they send mail to more than 500 users and we will get in trouble.

Who is 'they' in that statement?

[fathianf]

all 500 users are individual users which someone add them together with comma in one mail and send to my server. Actually the sender had made a mailing list like one I have on my server (which is not receiving mail normally) and then send mail to that fake distribution list, please let me know how to block mail when is coming for more than 3 user.

[veronica]

Can the IP be blocked on the firewall ?

[fathianf]

No, because we don't want anybody can send mail to a group of our accounts from other domains other than ours. So blocking an IP doesn't help as we need to have regular receiving mail from other domains.

[uxbod]

Originally Posted by fathianf

all 500 users are individual users which someone add them together with comma in one mail and send to my server. Actually the sender had made a mailing list like one I have on my server (which is not receiving mail normally) and then send mail to that fake distribution list, please let me know how to block mail when is coming for more than 3 user.

If they are using a mailling list server then they will be coming in as individual emails.

[veronica]

But you say its a forged domain right so in logs you would have the IP address of connecting server which for sure will not be that of gmail.

[phoenix]

Originally Posted by fathianf

No, because we don't want anybody can send mail to a group of our accounts from other domains other than ours.

I'm not really sure what you're asking for here but read this article first: RestrictPostfixRecipients - Zimbra :: Wiki

[fathianf]

I have already done "Restrict Postfix Recipients" and it works fine, but what I want is that: for example if you as a user@example.com ( from out of my country or domains) not to be allowed to send mail to more that 3 of my users which you added them to the "TO" section of your mail. Is there any way to check header for comma separated incoming mails? or may be zimbra can determine it as spam when you try to send for more recipients.