Workflow not sending email notfications
telnet smtp.server 25
Trying...
Connected to smtp.server
Escape character is '^]'
220 smtp.server ESMTP Sendmail Wed, 2 Oct 2013 11:23:00 +0200
EHLO smtp
250—smtp.server Hello smtp.server [00.00.00.000], pleased to meet you
250—ENHAHCEDSTATUSCODES
250—PIPELINING
250—EXPN
250—VERB
250—8BITMIME
250—SIZE
250—DSN
250—ETRN
250—DELIVERBY
250 HELP
MAIL FROM: email@comp.co
501 5.1.8 Domain of sender address email@comp.co does not exist
how to correct this error?