Re: message_size_limit documentation
Scott Kitterman: > Thanks. I don't think it's worth a lot of effort. I'd imagine it's a pretty > niche use case to send multi-gigabyte files via SMTP. People do do it though > (clearly or there wouldn't be a bug). > > I wrestled with a few options for a simple explanation, but didn't come up > with anything I particularly liked. I think it's correct that there's a hole > in the documentation, but I don't have a good recommendation on how to fill > it. In Postfix 3.7 I have updated the text for message_size_limit. message_size_limit (default: 1024) The maximal size in bytes of a message, including envelope information. The value cannot exceed LONG_MAX (typically, a 32-bit or 64-bit signed integer). Ditto for mailbox_size_limit. Wietse
Re: message_size_limit documentation
On Thursday, December 23, 2021 3:51:57 PM EST Wietse Venema wrote: > Scott Kitterman: > > Currently, postconf.5 has this to say about message_size_limit: > > > > message_size_limit (default: 1024) > > > > The maximal size in bytes of a message, including envelope > > information. > > > > Note: be careful when making changes. Excessively small values will > > result > > > > in the loss of non-delivery notifications, when a bounce message size > > exceeds the local or remote MTA's message size limit. > > > > > > It documents the default, but not the maximum. > > The maximum is determined by (kernel) resource limits, file system sizes, > and... > > > Apparently there is one (and > > > > who would care, one of Debian's users, apparently [1]). I'm not > > particularly confused about why there would be a maximum, but it might be > > reasonable to document what it is. Perhaps add something like "Maximum > > value is 2147483647." at the end of the note so that users don't have to > > find out the hard way: > > > > fatal: bad numerical configuration: message_size_limit = 2147483648 > > That is the LONG_MAX value for 32-bit machines. It's much bifgger > for 64-bit systems. > > I guess we could put that in the manpage. I have ab old wishlist > item to migrate file sizes from to off_t (which is 64 bits on > most systems). > > But that is a lot of effort, and I was kind-of hoping that 32-bit > systems will go away. Thanks. I don't think it's worth a lot of effort. I'd imagine it's a pretty niche use case to send multi-gigabyte files via SMTP. People do do it though (clearly or there wouldn't be a bug). I wrestled with a few options for a simple explanation, but didn't come up with anything I particularly liked. I think it's correct that there's a hole in the documentation, but I don't have a good recommendation on how to fill it. Scott K
Re: message_size_limit documentation
Scott Kitterman: > Currently, postconf.5 has this to say about message_size_limit: > > message_size_limit (default: 1024) > > The maximal size in bytes of a message, including envelope information. > > Note: be careful when making changes. Excessively small values will result > in the loss of non-delivery notifications, when a bounce message size exceeds > the local or remote MTA's message size limit. > > > It documents the default, but not the maximum. The maximum is determined by (kernel) resource limits, file system sizes, and... > Apparently there is one (and > who would care, one of Debian's users, apparently [1]). I'm not particularly > confused about why there would be a maximum, but it might be reasonable to > document what it is. Perhaps add something like "Maximum value is > 2147483647." at the end of the note so that users don't have to find out the > hard way: > > fatal: bad numerical configuration: message_size_limit = 2147483648 That is the LONG_MAX value for 32-bit machines. It's much bifgger for 64-bit systems. I guess we could put that in the manpage. I have ab old wishlist item to migrate file sizes from to off_t (which is 64 bits on most systems). But that is a lot of effort, and I was kind-of hoping that 32-bit systems will go away. Wietse > Scott K > > [1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=960272 > > >
message_size_limit documentation
Currently, postconf.5 has this to say about message_size_limit: message_size_limit (default: 1024) The maximal size in bytes of a message, including envelope information. Note: be careful when making changes. Excessively small values will result in the loss of non-delivery notifications, when a bounce message size exceeds the local or remote MTA's message size limit. It documents the default, but not the maximum. Apparently there is one (and who would care, one of Debian's users, apparently [1]). I'm not particularly confused about why there would be a maximum, but it might be reasonable to document what it is. Perhaps add something like "Maximum value is 2147483647." at the end of the note so that users don't have to find out the hard way: fatal: bad numerical configuration: message_size_limit = 2147483648 Scott K [1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=960272
