Some recipients not receiving emails from our new company email

[markmarko]

We are starting to use email accounts on a newly acquired domain. Using
Outlook 2003 and Exchange Server 2003.

If I send to my personal comcast.net account, I receive it. If I send to my
yahoo account, it receives it, but sticks it in the Spam Folder. If I send to
a Hotmail account, it apparently is recieved.

Most importantly, people at our main client are not receiving the emails.

Is there something I can do on our end to make our emails look less like
SPAM to various recipients?

 

[dlw]

go to senderbase.org and see if you are on any RBLs

 

[markmarko]

Thanks for that idea... I check and it said 'good' for our IP address.

I've also check a handful of other blacklists, such as Spamcop, and no
indication of negative reputation.