Can't send or receive mail from certain e-mail address...

Question

Has anyone ever run into an instance where you couldn't send or receive mail to a 1 specific e-mail address? Even after adding the address to your contact list?
Here's my situation. There is one person that is trying to e-mail me, but no matter what they do the e-mail won't come through to my icloud account. I seem to be the only person that's not getting the e-mail and even if someone else forwards or replies to this person it won't work. The first time I noticed it was a thread started by the e-mail address, then forwarded to a bunch of people by someone else. Everyone on the list got the message but me and was responding.. eventually 4 or 5 responses down the line I got someone's response with the chain of e-mails in it. I've tried getting the e-mail forwarded to me by various e-mails. Seems hit and miss. I did find that if I got the e-mail sent to my hotmail account then forwarded to icloud that worked. Trying the same thing through my work e-mail did not. If I tried to send an e-mail to this person originating from icloud to this person and cc'd my work and hotmail account. I didn't get the e-mail in my work or hotmail account nor did the person receive the message. Sorry if this is confusing, tried to make it as simple as possible. Any ideas about what could be going on? Only thing that comes to mind is that there is something about the message that apple is flagging as spam/junk and it never makes it through. (Nothing comes into my Junk mail folder either)
Thanks,
-G

Answer 1

checked the ip address of the computer when its connected to the router using the command promt.(example.....ip address: 192.168.1.100; Default Gateway:192.168.1.1).
Open an internet browser (ie, mozilla, netscape,etc.). Type at the address bar the default gateway (192.168.1.1). and you will see a username and password promt for your router. Leave the username blank and use admin for your password, if it doesn't work use the password you setup the router to..
Once you see the setup page.... you'll be at basic setup sub tab under setup. Look for MTU. Set it to MANUAL and LOWER IT TO 1300.  Save the settings. Check your outlook if its working....If its Does't work do this
Go to Applications and Gaming tab.
Look for a port triggering sub tab. type it this way
Application NameTrigger Port RangeIncoming Port Range
application       triggered range     forwarded range
E-mai                 l25 ~ 25                   113 ~ 113
forwarded range is equevalent to incoming port rage...
hope this will solve your concern....