More details would be required before anyone could answer this question.
What version of Outlook do you use?
Are there any send/receive error messages and/or numbers?
Do you receive any NDR's? (Non Delivery Report)
Do you know for sure people are not receiving your emails? Have they checked
their junk mail folder to make sure the email is not trapped?

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Kathleen Orland - MVP Outlook
Outlook Tips: http://www.outlook-tips.net/
http://www.howto-outlook.com/
I use Outlook 2003 SP2.
There are no messages, as far as I am concnerned all is well, except that
not everyone receives my messages. Tere seems to be no rhyme or reason to
this. I have tried group email, individuals to different ISPs, some receive
them, most do not... I do not know how long this has been going on... was
just stranges to not get replies. I tried to request read receipts, but they
didn't come.
I send these email from my church office computer to parishioners who have
always received my mails and for the last few weeks just thought I hadn't
send any...
> More details would be required before anyone could answer this question.
>
[quoted text clipped - 6 lines]
> > It seems like people are not receiving my emails even though they show up as
> > sent. Anyone have any ideas what would casuse that? Thanks
donnabivi - 21 Sep 2007 23:56 GMT
I started with this exact problem today. My ISP cannot help me. I am also
not receiving any error messages. I am using Outlook Express from my home
computer. I am able to receive emails and send them but the people I send
them to are not receiving them.
> I use Outlook 2003 SP2.
> There are no messages, as far as I am concnerned all is well, except that
[quoted text clipped - 17 lines]
> > > It seems like people are not receiving my emails even though they show up as
> > > sent. Anyone have any ideas what would casuse that? Thanks
Brian Tillman - 24 Sep 2007 19:33 GMT
> I started with this exact problem today. My ISP cannot help me. I
> am also not receiving any error messages. I am using Outlook Express
> from my home computer. I am able to receive emails and send them but
> the people I send them to are not receiving them.
You are in the wrong newsgroup. Ask Outlook Express questions in
news://msnews.microsoft.com/microsoft.public.outlookexpress.general

Signature
Brian Tillman [MVP-Outlook]