As it seems in rfc2821:
The maximum total length of a text line including the <CRLF> is
1000 characters (not counting the leading dot duplicated for
transparency). This number may be increased by the use of SMTP
Service Extensions.If I am not wrong (I really may be here), the subject header should be on one line, so the size should be approximately 1000 characters. Odhiambo Washington wrote: > Hello everyone, > > Today, a customer reported to me having received an e-mail which had > everything (I mean what would under normal circumstances go into the > body) as part of the subject. > > This kind of spam can be blocked, but I am wondering: > > (a) What is, according to the RFCs, supposed to be the acceptable > maximum length for the subject line? > (b) Which acl_smtp_* would be the best to block this type of spam? > (c) Finally, can someone vote their rule as the best/most effective > against such spam? I need to copycat that one which is considered > the best ;) > >
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