Outlook 2007 - emails not going out, but sitting in the Outbox

My OS is win 7 prof 64 bit and I use Outlook 2007.  My email is MSN, the free version and my ISP is Comcast.  Thanks to awesome tips I got from this EE, I was able to delete the IMAP account and install   POP3 and that solved the problem of emails taking ages to download everytime I open outlook.  
Continuing my saga with Outlook 2007, now my emails are not going out but sitting in my Outbox, and even though I opened it and resent them, but it is still sitting there.  This happened after I did a mail merge of an email blast, but I only sent about 65 emails on the first day, and 70 on the second day.  I wonder if this has anything got to do with my email still sitting in the Outbox, where I may have over used my quota.  BTW the email blast emails all got sent successfully.
If it is this quota problem is there any way I could resolve this.   Thank u for your advise.
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JohnBusiness Consultant (Owner)Commented:
I cannot answer the question about quota because I do not know, but if your Outlook now is pure POP3 (no IMAP), then make sure you have the correct settings. You have used Outlook enough now to know where things are, so I will not post pictures unless you need them.

What settings:

1. Incoming and outgoing mail server settings - ensure correct.
2. Userid and password - ensure correct.
3. Advanced setting, Outgoing Server - authenticate if need be and use the setting with userid and password. Mail will not go out if proper authentication is not provided.
4. Advanced settings, Ports - You probably need 995/SSL for incoming mail and 465/585/SSL or TLS for outgoing mail. Again, if not correct, mail does not flow.

If you have ensured the certainty of the above, then you may have sent out over quota.

.... Thinkpads_User

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jegajothyretiredAuthor Commented:
In response to Thinkpads_User I think the problem was on the quota.  After nearly 3 days of not sending any email, the emails went out finally.  I guess this may be the problem although I cannot point a finger on it, besides I have followed all your check list which is the same when I set up the account.  Thank u so much for your inputs.   At least I now know what to watch out for, the unseen and undocumented pitfall.
jegajothyretiredAuthor Commented:
thank u for a good check list to have about.
JohnBusiness Consultant (Owner)Commented:
@jegajothy - Thank you and I was happy to help.  I am glad mail is working for you now.

... Thinkpads_User
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