email to 1 recipient blocked
Enthusiast - Level 2

everytime i send an email to this 1 particular email address i get this message. this just started about 2 weeks ago. before that i had no problem. i can send email to them from another email acct on aol so i know the email address is correct. my email works correctly to everyone else. do you have a solution?

Sorry, we were unable to deliver your message to the following address.

Remote host said: 554 5.7.1 Service unavailable; Client host [] blocked using; Blocked - see [RCPT_TO]