Megaserver blocking important email -

[L1service]

We have a situation where we need to make sure that no matter what emails from specific domains will come through - so regardless of the content of the email or attachments or anything that might cause the email to be marked as spam or blocked we want it to come through.  How do we get Megaserver to do this?  What settings are there for 'let it through' unconditionally?  In particular we have some situations where it seems Megaserver is rejecting because of the way the client might have their MX/DNS configured.   We can't tell these folks - our important clients - to change their IT infrastructure to fit ours and Megaserver when we are the only ones they are having the problem with.  This is what their tech wrote - 'Your spam filter - our firewall is using ISP xxx.xxx.xxx 123 but our MX record is pointing to our email is xxx.xxx.xxx.456.  You folks see that as forged.  Just started lately and only for you.  The SPF is set properly and includes both IP's.  Megaserver must have done something new lately for this to happen.  Never was a problem before and we have  been corresponding with you for a long time. " We don't understand any of this - we are not technical All we know is that these folks are a big client, we are a small fish.  We need to just get their emails.

[mdk]

@L1service -- our firewall is using ISP xxx.xxx.xxx 123 but our MX record is pointing to our email is xxx.xxx.xxx.456. 

That is unclear technical writing, if you transcribed it correctly.

However, compare it to a delivery-truck coming to a store, and ignoring the signage "all deliveries must go to the loading dock at the back", and trying to deliver through the entrance that customers use.  No, no, no.

If your E-mail system is finding the "A" (IP address) record for "BigCompany.com" (usually the IP-address used by the web-server for their company, along with www.BigCompany.com) instead of your system doing a DNS-query for the "MX" ("mail-exchanger") record (the IP-address for their mail-server for their company), then you have the "front-door/back-door" problem.

However, if your mail-server does a query for the "MX" record, and do not receive a response within the usual "wait-time", your mail-server might (wrongly) assume that there is no "MX" record, and so your mail-server will do a query for the "A" record, and the servers at BigCompany will reject your E-mail.

> regardless of the content of the email or attachments or anything that might cause the email to be marked as spam or blocked we want it to come through

That is the exactly the setting that spammers would love to have.  🙂