Cannot receive mail on laptop

Hi all,
I have mac mail set up on my laptop and have it configured exactly the same as the mac mail on my Mac Pro. I cannot receive mail on the Macbook Pro when I am away from the office and on a different network than at the office. I always get a 'certificate is not valid' warning.....then check 'always trust' but I can still not retrieve email from my server. Any ideas?
Thanks in advance.
Best,
Dennis

Many sites, whose mail/web sites utilize SSL, create SSL certificates and register them through a third-party broker like Verisign or Thawte, for example, in order that site visitors or authorized users have an independent and trusted verification of authenticity that they are not connected to a rogue site masquerading as the authentic site. These certificates have an expiration date because otherwise, how will these brokers make money? Their customers renew their certificates and pay the broker a renewal fee. If an online site that uses SSL doesn't register their certificate, or if it has expired, individuals connecting to their site will get warning messages like that.

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