Trouble sending emails (recipients not receiving them)

[Nourished]

I have Outlook 2007/ Vista with Comcast Internet service. I can receive
email, but when I most people are not receiving my emails. No error message
and they are not being sent back. I am both replying to their email and
starting a new email...I have moved from my PC to an older laptop and now to
a brand new 64bit computer. I had this issue start when I was with Infoquest.
I thought it was an issue with them. I changed my email address and changed
over to Comcast as my mail server. I let Outlook configure the email account.
In the beginnning, outgoing and incoming work fine. Within one day my
outgoing our not being received by recipients. I have removed my router and
connected directly through my modem. I let it cycle off for five minutes and
restarted my computer. This issue has occurred on three computers, each with
Outlook. I can send and receive just fine when I am the web mail server with
Comcast. The 'test email' works as well.

Comcast said that the 'use following type encryption' should be 'SSL.' The
default when Outlook configures is 'TLS.' Current configuration is outgoing:
995, incoming: 587. box is checked 'this server requires encyrpted' and box
is checked 'outgoing server requires authentication.' I have tried using
defaults: 110, 25 and does not need authentication...still does not work.

If I change to 'SSL' and test account settings I get an error stating '
server does not support the connection encyrption type you have specified.
try changing encryption method'

Three different machines with three different Outlooks would point me
towards user error. I have been using Outlook with Infoquest and same email
account for three years...no issues. Issue just started last week. I changed
mail service, removed my router and am able to receive email just fine. I
have been getting technical support through a computer company and have
walked through everything else that they know.

Any ideas??

 

[Candie1973]

I have Comcast too, but I am using windows mail.... Just in the last week, I
realized MOST of my outbound emails are not being rec'd. I sat on the phone
w/ comcast for three hours and they say it's because of windows mail.... I
just don't understand why some receive my emails, but others dont. I have
removed then readded my account. I have disabled my antivirus program. I
removed the antivirus program, sent a test email, wasn't rec'd....so I
reinstalled mcafee.... I am at my wits end on this. I have tried everything.
This all started this last week.

I am searching for employment, so it's very scary to know many of my emails
to prospect employers haven't been rec'd.

Does anyone have any knowledge as to why outgoing messages wouldn't be
rec'd???

I have the correct outgoing port info for comcast.... which is 587.... I
have taken down my wireless, readded. I really can't figure this out. I
have had some say it has got to be my isp, but Comcast says it's not an issue
w/ them.

Any, any help would be so helpful. I did find info on how to remove windows
mail and readd, but I am so scared to do that, fearing I might not save all
my files correctly.....

I would appreciate any insight. Thank you soooo, soooo much!

Candice