Long subject line word-wraps in an Indy SMTP mail

Hello all,

I'm using Indy to send an email via SMTP to an SMS gateway. The whole SMS
message (up to 160 chars) is passed on the subject line. Unfortunately the
subject line seems to be getting word-wrapped and the SMS gateway doesn't
like that.

I've been able to verify this by looking at the raw message received by my
mailserver. Problem is I've no way of knowing if it's Indy that's doing the
wrapping or my mailserver.

Any ideas?