If you have characters outside the 7-bit ASCII range in headers, you need to base-64 encode the headers, and prefix =?...?B:

use MIME::Base64;

my $charset = 'your charset';
my $subject = 'your subject, containing non-ASCII chars';
my $header = "=?$charset?B?".encode_base64($subject)."?=";

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In reply to Re: Problem with russian / cyrillic in e-mail program. by Corion
in thread Problem with russian / cyrillic in e-mail program. by dbmathis

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