can not send email

[Q Kong]

hi, all
i'm new to kolab, i just install kolab on redhat. Right now i can send email
in local, but i can't send email to outside. for example, i set domain to
abc.com, so i can send email between a at abc.com and b at abc.com, but i can't
send email to a gmail account
anyone can help?

thanks
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