Hack?

I am tunnelling my pop3 email through SecureCRT via ssh tunnelling.
Recently I keep getting this error from SecureCRT periodically when I
receive emails:

Decrypting Packet: received/computed checksum error.

Has my mail server or sshd been cracked? I've run chkrootkit and have found
nothing.

I am running OpenSSH_3.4p1, SSH protocols 1.5/2.0, OpenSSL 0x0090581f and
Sendmail 8.11.16.2.

 

 

 

 

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