[Zope] sending mail from python script, strangeness with symbol ':' in body

Hello! When i try to send mail from python script and body of message contains symbol ':' then i get letter without subject and body. In MailHost source i found send_simple, when using it i have no problems, but with 'send' method i have abovemetioned problem. I tested with zope2.6.1 and 2.6.2 Your help is very appreciated. Best regards, Ruslan