when i reply to a job in craigslist they bounce back

When i reply to jobs on craigslist, they bounce back. I log on to my mac thru icloud because i cannot access my emails directly [another story] and when i reply to jobs the bounce back message. below is what the message says. I am so frustrated and want to reply to these jobs I hv copy pasted in a new message also doesntwork.I have attached pdf docs etc but I dont think tht is the reason. Please advise... Your message is being returned; it has been enqueued and undeliverable for 4 days to the following recipients: Recipient address: 78ngn-2900541711@job.craigslist.org Reason: unable to deliver this message after 4 days Delivery attempt history for your mail: Sun, 18 Mar 2012 22:36:29 +0000 (GMT) Error reading SMTP packet; response to dot-stuffed message expected; likely problem with network or remote SMTP server Sun, 18 Mar 2012 14:35:27 +0000 (GMT)

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