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Why do some of my contacts not receive my emails?

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jaleonatti
jaleonatti
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Some of my contacts can't receive my emails. I get the following error messages: 

"Remote host said: 553 5.1.3 bad address syntax"

"Remote host said: 501 Invalid Address [RCPT_TO]" "Remote host said: 501 Syntax error in parameters or arguments [RCPT_TO]"

I have talked to them personally and they say they aren't trying to block my messages.

The email addresses involved never used to give me a problem. Now it's every time.

Some of my contacts can't receive my emails. I get the following error messages: "Remote host said: 553 5.1.3 bad address syntax" "Remote host said: 501 Invalid Address [RCPT_TO]" "Remote host said: 501 Syntax error in parameters or arguments [RCPT_TO]" I have talked to them personally and they say they aren't trying to block my messages. The email addresses involved never used to give me a problem. Now it's every time.

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Matt
Matt
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are you requesting return or read receipts?