MS Outlook Problem

What antivirus you have?
Disable mail scanning or disable altogether temporary and do testing.

I gave up my eircom.net address a few months back as running a business from it became a head wreck.

I now use an info@mywebsiteaddress email address. Superb!

My problems with eircom.net were that, all of a sudden, I couldn't include my web address in my email template signature. If I sent it to a recipient who was also using an eircom.net address, the email would go straight into their spam folder and they would have to look for it there (as we discovered).

Put simply, eircom.net email addresses are a joke. They are a legacy hangover which eir.ie inherited when they took over the company, and they do not support it. (Before I changed, I tried using Eir support. They will only deal with you if you have an Eir account number. I don't; I'm with Virgin.)

As of this last week, emails which I am sending to eircom.net addresses (using my new email address) are again going straight into their Spam folders. What's more, when they retrieve them, they cannot reply to them unless they remove my web address from the body of the text.

Fortunately, these are just a couple of private emails. All my business emails are fine. No one would run a business from an Eircom.net address. I must have been one of the last!

D.

Eircom infrastructure is unreliable the client errors are because the ping from your client to their server is not returning anything in the time frame the client expects, therefore you could suspect you have too much latency or worse network drop outs, which would not surprise me given past experience with them. try a different email server such as GMAIL easy to add to outlook if its the same then time for an internal and external network troubleshooting to determine a plan of action if not then its Eircom's email server. Unless you really need POP, IMAP is more efficient.