Hi, I'm with a small internet provider. Out emails seem not to be getting through to any GOVERNMENT clients. I have 3 customers with this issue so far. An error message is below:

----- Transcript of session follows -----
<[emailprotected]>... Deferred: Invalid argument
Warning: message still undelivered after 4 hours
Will keep trying until message is 5 days old

Any thoughts on what this could be? I think the first step is to FIGURE out who's side the problem is on. I have a hunch it is us. We're reknown for our spam. Also, seems most of the time, customers can send emails to other addresses no problem. The main problem is with government emails.

Any clues?? Need any more info, let me know!The government has strict security. Especially after the past few years of hacks and leaks. My suggestion is to contact an Government Official who run their IT Dept and see if its is a mail filter issue. MAYBE your e-mail is being BLACK listed or tagged as spam.

DaveCool thanks. After spending the DAY on this, it seems like that is true and they've been notified.

Thanks!