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So I have clients that are not pleased because this one client... can not receive email from our server. Root cause is that the domain has no MX record. Thought that all domains have SOP of having MX. Apparently not.
Where the client got upset is: Apparently sending through Yahoo & Google - both send to the offending domain.
The only thing that I can think of, is that they are using an 'A' record, when no MX record is found.
Apparently SmarterMail doesnt do that.... I am just curious whom else has ran into this.. and how you handled it?