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Email can't send to my mail server

By PetNet ·
My company have two email system, one is using Lotus Domino, another is Sandmail. Lotus is under the main domain(mydomain.com.sg) & the sandmail is under the sub doamin(sub.mydomain.com.sg). DNS is host by ourself, with two MX record, one pointing to the Lotus, & the other pointing to the Sandmail.
The problem now is some of the mail server(mostly in the US) can't send mail to the Sandmail server. They will get the error "doamin unreachable".

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My #1 Answer for these problems...

by ghstinshll In reply to Email can't send to my ma ...

Is your DNS registratio paid up to date? I've seen it a few times where my clients had registered X domain X years ago, and never followed through with renewing the payments...

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