c# - Email subject problem -

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i using mailmessage class in program. when subject long subject like.

subject:

=?utf-8?b?w0vudgvychjpc2uguhjpb3jpdhldic0gq3vzdg9tzxigsw5jawrlbnqgnjkxnzigzm9yiehhcmlkagfyyw4gkdezmjm5oskgagfyawroyxjhbnjac3luy2z1c2lvbi5jb20goibuzxn0aw5nifrlc3rpbmcgvgvzdgluzybuzxnpbmcgvgvzdgluzybuzxn0aw5nifrlc3rpbmcgvgvzdgluzybuzxn0aw5nifrlc3rpbmcg4o"

this problem occurred in server only. while debugging have used same subject content in "local" but, got correct subject.

program:

protected mailmessage msg; msg.subject = subject;

got same (error) subject in webmail.ihostexchange.net also.

what problem?

update:

this part of coding.

  public emailsenderthread(string emailaddresses, string ccemailaddress, string from, string subject, string body)             : base()         {             msgthread = new thread(new threadstart(mailsender));             this.mailaddress = emailaddresses;             this.ccmailaddress = ccemailaddress;             msg.from = new mailaddress(from);             msg.isbodyhtml = true;             msg.body = body;                       string[] mails = emailaddresses.split(';');             foreach (string mail in mails)                 if (!string.isnullorempty(mail))                     msg.to.add(mail);             if (ccemailaddress != string.empty)             {                 string[] ccemails = ccemailaddress.split(';');                 foreach (string ccmail in ccemails)                     if (!string.isnullorempty(ccmail))                         msg.cc.add(ccmail);             }             msg.subject = subject;             msgthread.start();         }

i have tried 

msg.subjectencoding = system.text.encoding.utf8;

but got same error. did got doubt. please let me know if didn't explain clearly.

1) why working fine in local? , why not working when hosting server. ?

2) maximum length of subject line?

2) maximum length of subject line?

from rfc822 unstructured header fields:

some field bodies in standard defined "unstructured" (which specified below us-ascii characters, except cr , lf) no further restrictions. these referred unstructured field bodies. semantically, unstructured field bodies treated single line of characters no further processing (except header "folding" , "unfolding" described in section 2.2.3).

the subject line unstructured field, , therefore has no imposed length limit.


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