Initially I had problems sending emails, then it was identified that my ISP's SMTP was interfering, now that is sorted, I can send out emails and it reaches the intended recipient within few minutes (less than a minute in all the cases I've tried). But when they send me a reply to my email or when they compose a new email I'm not receiving then and they are getting bounce back message like the following:- Your message did not reach some or all of the intended recipients. Subject: Hi Sent: 18/08/2005 12:58 The following recipient(s) could not be reached: [email protected] on 18/08/2005 12:58 There was a SMTP communication problem with the recipient's email server. Please contact your system administrator. <smtp1.smtp.dlt.com #5.5.0 smtp;554 <[email protected] [P.S: [email protected] was used just to hide the actual email id ] What can I do to prevent this happening? Many thanks to all your help. [Falko/Timme, please note I've not yet tested the Outlook, will update those forum messages shortly] - Nanda.