I am trying to send out a large number of newsletters via outlook express. I completed 80% of them but got to the last 5 and they will not go out. In fact I can no longer send any e-mails. I get An unknown error has occurred. Account: 'mail.comcast.net', Server: 'smtp.comcast.net', Protocol: SMTP, Server Response: '554 omta12.emeryville.ca.mail.comcast.net comcast Message sending error. Please go to http://help.comcast.net/content/faq/VBOB', Port: 25, Secure(SSL): No, Server Error: 554, Error Number: 0x800CCC6FWhat can I do?

This article in Comcast's Help pages describes how to configure Outlook Express:http://customer.comcast.com/(X(1)S(ww2jmtmws32qvw55cipqsdfg))/Pages/FAQViewer.aspx?Guid=b454828c-37a6-459a-9191-2a1b0f2bb20eBrian Tillman [MVP-Outlook]

#1: Servers have a limit on how many recipients you can send to at one time. You may be exceeding the limit. Try breaking it down to a few groups & contact Comcast to find out the exact number of recipients they allow.#2: Change the SMTP port to 587 and make sure: My Server Requires Authentication is checked. How do I set up/configure Outlook Express, Windows Mail & Windows Live Mail for Comcast email?http://www.comcast.com/customers/faq/FaqDetails.ashx?Id=2288 Bruce Hagen MS-MVP [Mail]

WOW! Thanks Bruce. Your suggestions worked fine for me. I'm able to send emails again.

You're welcome.Bruce Hagen ~ MS-MVP [Mail]

I am having the same problem on Outlook 2007 on my PC and also on Outlook Express on my wife's PC. I have tried everything that Comcast has suggested as well as removing my account and recreating it, turning off McAfee Spam filters and repairing Microsoft Office. I believe that the problem started after I tried sending a large number of emails to the same address. I checked with Comcast to see if my account was flagged for sending spam and they said that it was not. I can send email from my browser using Comcast online with no trouble.???Thanks for any help

Please post any error message in its entirety. You can left click on it to highlight and then right click to copy and then paste it into this thread.Bruce Hagen ~ MS-MVP [Mail]Imperial Beach, CA

I also have this fault.An unknown error has occurred.Subject 'Re: hello'Server Error: 554Server Response: 554 Transaction failed : Cannot send message due to possible abuse; please visithttp://postmaster.yahoo.com/abuse_smtp.html for more informationServer: 'mail.btinternet.com'Windows Live Mail Error ID: 0x800CCC6FProtocol: SMTPPort: 25Secure(SSL): NoCan you help me.

It is what it says. You have been banned for possible abuse. Contact your ISP.Please start your own new thread in the future instead of hijacking an old one. Thank you.Bruce HagenMS-MVP Oct. 1, 2004 ~ Sept. 30, 2010Imperial Beach, CA