Hello,
Every time I see a post regarding this issue I have hopes that someone has solved it, but again I am disappointed.
I have the same issue, and I have seen quite a few other posts with this same issue and no Intuit representative has resolved this issue yet as far as I can tell. That you can't resolve such a simple issue is extremely frustrating. They just keep giving the same answers above, some of which do not really make sense until the person gives up. I just paid thousands of dollars for a new edition of QB Enterprise which has this issue, and supposedly has support, but the support people either seem uninterested in solving it or just don't know how. My last try I spent over an hour demonstrating the issue to a representative and his only response was that I should "get another email account, that is our suggestion". Of course I don't want to start sending people invoices from a strange email, and it makes no sense that this issue as described would be solved by using another email or contacting the email provider. Please let me elaborate:
1) I have tried every suggestion above in your post, and more, including removing and adding the email back in. None of these affect the issue. It works the first time, then recurs.
2) It makes no sense to contact the email provider as it works when you type in the correct password. The issue is that Quicbooks does NOT REMEMBER the password except for a few minutes. You can send a few more emails once you have entered the correct password, but in a while goes away for a long pause and then it comes to tell you it could not connect to your mail server and gives you the option to change your password. Entering the correct password at this time puts you back in the working loop for a while. I don't see how this could possibly be on the server end. Also other email clients can connect to the server at all times using the same credentials.
3) The email provider is me. I am running my own mail server and have verified that QB is sending incorrect login information to the server using the server logs which I can supply.
4) The problem is NOT that the original poster or myself or all the other people who have had this problem and just gave up don't know how to set up the email. It is that Quickbooks somehow "loses" the login credentials after a short time. It makes no sense for a server I can log into repeatedly with other clients using these credentials is suddenly refuse to accept them from Quickbooks after accepting them just a short time ago. Its possible that QB does something else like messing up the encryption after a time, rather than the password, that would be for your devs to figure out. I can only see the failed login attempts on my server. I have gone as far as to dump the encryption keys to make sure they the ones it is giving out are correct. Email is very standardized and I can't believe that I am having an issue like this in this day and age.
I will be more than happy if you have a genuine interest in resolving this issue to post server logs, or give you remote access to my machine where you can watch the interaction of the server and QB.
