Re: Effects of very large message_size_limit?
On Thu Sep 15 2016 14:00:46 mro...@insiberia.net said: > > But can anyone answer my question - what factors should I consider when > increasing the limit in the 30-50MB range (or higher)? Are there drawbacks to > doing this? The main factor is that the limit used by most everyone is about 20-25MB so if you accept larger attachments, you will often not be able to send those mails on for delivery or forward or whatever. I set my limit (increased it) to 25MB to match gmail and that gives me a perfect reason if anyone asks (If the limit is larger, then people who forward their mail to or from gmail will have problems). As far as other drawbacks, if you are still using mbox files your files will get very large very fast, and that’s incredibly inefficient with mbox. Nothing quite like trying to fix a 12GB mbox file. There is absolutely no need to send large files via email as there are hundreds, if no thousands of other options, almost all of which will be more robust, more secure, and have a much smaller impact on what is still a critical service for most people.
Re: Effects of very large message_size_limit?
mro...@insiberia.net: > On 2016-09-15 13:55, wie...@porcupine.org wrote: > > mro...@insiberia.net: > >> On 2016-09-14 23:34, Robert Schetterer wrote: > >> > Am 15.09.2016 um 07:19 schrieb mro...@insiberia.net: > >> >> Hi, I'm wondering what the downside of setting a large > >> >> message_size_limit are? > >> >> > >> >> By "large" I mean 30MB, 40MB, 50MB > >> >> > >> >> I think sendmail has a default of no restriction for message size - > >> >> that > >> >> seems crazy, but maybe I don't understand the risks well enough. > >> > > >> > some freemailers have a limit of 10 MB, so its perhaps a good choice to > >> > set it for outgoing external mail, for inside a higher amount up to 50 > >> > sometimes makes sense > >> > >> I'm aware of the range of limits, for example: > >> > >> https://www.outlook-apps.com/maximum-email-size/ > >> > >> But can anyone answer my question - what factors should I consider > >> when > >> increasing the limit in the 30-50MB range (or higher)? Are there > >> drawbacks to doing this? > > > > Obviously, the size of the file system determines how large your > > email messages can be. Postfix will stop accepting mail delivery > > transactions when the free space in the queue directory is less > > than 1.5 times the message size limit. > > I see, so Postfix doesn't experience any bottlenecks or congestion in > other ways with 50MB+ attachments? If size of filesystem is the main > concern, quotas are easy way to keep it under control. In that case, is > there argument against a limit of say 100MB? The answer depends on how fast your network is, how fast your file system is, whether recently accessed files can be cached in main memory, and what kinds of deep content inspection you're doing. A matchbox-size firewall appliance will struggle with email messages that a beefier box will handle without a sweat. Wietse
Re: Effects of very large message_size_limit?
On 2016-09-15 13:55, wie...@porcupine.org wrote: mro...@insiberia.net: On 2016-09-14 23:34, Robert Schetterer wrote: > Am 15.09.2016 um 07:19 schrieb mro...@insiberia.net: >> Hi, I'm wondering what the downside of setting a large >> message_size_limit are? >> >> By "large" I mean 30MB, 40MB, 50MB >> >> I think sendmail has a default of no restriction for message size - >> that >> seems crazy, but maybe I don't understand the risks well enough. > > some freemailers have a limit of 10 MB, so its perhaps a good choice to > set it for outgoing external mail, for inside a higher amount up to 50 > sometimes makes sense I'm aware of the range of limits, for example: https://www.outlook-apps.com/maximum-email-size/ But can anyone answer my question - what factors should I consider when increasing the limit in the 30-50MB range (or higher)? Are there drawbacks to doing this? Obviously, the size of the file system determines how large your email messages can be. Postfix will stop accepting mail delivery transactions when the free space in the queue directory is less than 1.5 times the message size limit. I see, so Postfix doesn't experience any bottlenecks or congestion in other ways with 50MB+ attachments? If size of filesystem is the main concern, quotas are easy way to keep it under control. In that case, is there argument against a limit of say 100MB?
Re: Effects of very large message_size_limit?
mro...@insiberia.net: > On 2016-09-14 23:34, Robert Schetterer wrote: > > Am 15.09.2016 um 07:19 schrieb mro...@insiberia.net: > >> Hi, I'm wondering what the downside of setting a large > >> message_size_limit are? > >> > >> By "large" I mean 30MB, 40MB, 50MB > >> > >> I think sendmail has a default of no restriction for message size - > >> that > >> seems crazy, but maybe I don't understand the risks well enough. > > > > some freemailers have a limit of 10 MB, so its perhaps a good choice to > > set it for outgoing external mail, for inside a higher amount up to 50 > > sometimes makes sense > > I'm aware of the range of limits, for example: > > https://www.outlook-apps.com/maximum-email-size/ > > But can anyone answer my question - what factors should I consider when > increasing the limit in the 30-50MB range (or higher)? Are there > drawbacks to doing this? Obviously, the size of the file system determines how large your email messages can be. Postfix will stop accepting mail delivery transactions when the free space in the queue directory is less than 1.5 times the message size limit. Wietse
Re: Effects of very large message_size_limit?
On 2016-09-14 23:34, Robert Schetterer wrote: Am 15.09.2016 um 07:19 schrieb mro...@insiberia.net: Hi, I'm wondering what the downside of setting a large message_size_limit are? By "large" I mean 30MB, 40MB, 50MB I think sendmail has a default of no restriction for message size - that seems crazy, but maybe I don't understand the risks well enough. some freemailers have a limit of 10 MB, so its perhaps a good choice to set it for outgoing external mail, for inside a higher amount up to 50 sometimes makes sense I'm aware of the range of limits, for example: https://www.outlook-apps.com/maximum-email-size/ But can anyone answer my question - what factors should I consider when increasing the limit in the 30-50MB range (or higher)? Are there drawbacks to doing this?
Re: Effects of very large message_size_limit?
On 2016-09-15 07:19, mro...@insiberia.net wrote: Hi, I'm wondering what the downside of setting a large message_size_limit are? By "large" I mean 30MB, 40MB, 50MB I think sendmail has a default of no restriction for message size - that seems crazy, but maybe I don't understand the risks well enough. accept and bounce imho use multipart mime instead, or cloud storages for fileshareing thunderbird can do this with a plugin dont know if others can make it simple
Re: Effects of very large message_size_limit?
Am 15.09.2016 um 07:19 schrieb mro...@insiberia.net: > Hi, I'm wondering what the downside of setting a large > message_size_limit are? > > By "large" I mean 30MB, 40MB, 50MB > > I think sendmail has a default of no restriction for message size - that > seems crazy, but maybe I don't understand the risks well enough. some freemailers have a limit of 10 MB, so its perhaps a good choice to set it for outgoing external mail, for inside a higher amount up to 50 sometimes makes sense Best Regards MfG Robert Schetterer -- [*] sys4 AG http://sys4.de, +49 (89) 30 90 46 64 Schleißheimer Straße 26/MG, 80333 München Sitz der Gesellschaft: München, Amtsgericht München: HRB 199263 Vorstand: Patrick Ben Koetter, Marc Schiffbauer Aufsichtsratsvorsitzender: Florian Kirstein
