> Does anyone know if there is a maximum size that a single header
> field is allowed to be? To some outgoing messages I need to add an
> additional field to the header. The data within that field can get
> large (probably not larger than 512 bytes, but it's possible).
The RFC isn't too clear on this, in my opinion. RFC821 says that a "text line" can
have a maximum length of 1000 characters. But, unlike 99.9% of RFCs, it doesn't
specify what a text line is. I would assume that means the DATA section of a SMTP
transfer, which would include headers. RFC822 doesn't seem to specify any maximum
header lengths.
-Scott
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