Re: sendmail corrupts long header From


I suppose that checking RFC5321 at sections 4.5.3.1.{1,2,4} could be a
start?

My example doesn't violate any of these sections. It is header From with
4 strings of 75 (about) chars in length.

well? 4*(64+N) used to be bigger than 256.

Is it "Local-part", "Domain" or "Command Line"? No, I think.

Maybe this can be applied:
4.5.3.1.3. Path
   The maximum total length of a reverse-path or forward-path is 256
   octets (including the punctuation and element separators).

Do you mean that the huge unreadable lines you quoted are not
only unreasonable headers but real SMTP <path>s ???
No, it's header. I thought, "reverse-path or forward-path" is a
header.

Then, maybe,
4.5.3.1.6. Text Line
The maximum total length of a text line including the <CRLF> is
1000
octets (not counting the leading dot duplicated for transparency).
This number may be increased by the use of SMTP Service Extensions.

But strings in my case are not such long.

Now, mind that on each relay your mails will pass through you may
find their mailmasters enforced some header size settings,
see in the cf/README about confMAX_MIME_HEADER_LENGTH
(eg grep -C3 confMAX_MIME_HEADER_LENGTH /usr/share/sendmail-cf/README)
My usual settings are 256/128 and I think you'll meet this setting
on many other relays than mine.
This parameter doesn't apply for From, I think. It's for headers in $=
{checkMIMETextHeaders}.

Also, Postfix accepts such headers without problems.
.

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