Ok, I added zlib to imap protocol. protocol imap { ? mail_plugins = $mail_plugins zlib } Now both imap and lmtp protocols have zlib plugin enabled, and both send and receive mail is compressed. Peter> On 10 Jun 2017, at 6:50 pm, Aki Tuomi <aki.tuomi at dovecot.fi> wrote: > > Please check that you are not overwriting mail plugins for lmtp. Or post your doveconf -n. > > Aki > >> On June 10, 2017 at 11:10 AM Peter West <lists at pbw.id.au> wrote: >> >> >> Not sure what you mean. I?m using lmtp to send messages to Dovecot from Postfix. >> >>> On 10 Jun 2017, at 6:08 pm, Aki Tuomi <aki.tuomi at dovecot.fi> wrote: >>> >>> What's your LDA? >>> >>> Aki >>> >>>> On June 10, 2017 at 11:01 AM Peter West <lists at pbw.id.au> wrote: >>>> >>>> >>>> Thanks for that Aki. >>>> >>>> Follow-up question. I tried to initiate compression by adding >>>> >>>> mail_plugins = $mail_plugins zlib >>>> >>>> plugin { >>>> zlib_save_level = 6 >>>> zlib_save = xz >>>> } >>>> >>>> >>>> to dovecot.conf. I restarted dovecot and sent one message to the server, and one message from the server. Neither was compressed. I changed the save type to >>>> >>>> zlib_save = bz2 >>>> >>>> and repeated. This time the message received (in /var/vmail/<host>/<username>/cur) was not compressed, but the message in /var/vmail/<host>/<username>/.Sent/cur was bzip2 compressed. >>>> >>>> Why is the received mail not being compressed? Is this the point of the discussion about compressing old mails? >>>> >>>> >>>>> On 10 Jun 2017, at 4:43 pm, Aki Tuomi <aki.tuomi at dovecot.fi> wrote: >>>>> >>>>> >>>>>> On June 10, 2017 at 5:58 AM Peter West <lists at pbw.id.au> wrote: >>>>>> >>>>>> >>>>>> Concerning Maildir, the wiki page on compression has this: >>>>>> >>>>>> All mails must have ,S=<size> in their filename where <size> contains the original uncompressed mail size, otherwise there will be problems with quota calculation as well as other potential random failures. Note that if the filename doesn?t contain the ,S=<size> before compression, adding it afterwards changes the base filename and thus the message UID. The safest thing to do is simply to not compress such files. >>>>>> >>>>>> Further down on the same page is this: >>>>>> >>>>>> If the file does exist, rename() (mv) the compressed file over the original file. >>>>>> ? Dovecot can now read the file, but to avoid compressing it again on the next run, you'll probably want to rename it again to include e.g. a "Z" flag in the file name to mark that it was compressed (e.g. 1223212411.M907959P17184.host,S=3271:2,SZ). >>>>>> >>>>>> These comments seem to contradict each. Or is there a difference between adding the size specifier to the filename and adding a Z flag to the end of the file name? >>>>>> >>>>>> -- >>>>>> Peter West >>>>>> pbw at pbw.id.au >>>>>> And the great throng heard him gladly. >>>>>> >>>>> >>>>> Keyword is 'base filename'. From the wiki, "The standard filename definition is: "<base filename>:2,<flags>".". Z is a flag. >>>>> >>>>> Aki >>>> >>-------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 235 bytes Desc: Message signed with OpenPGP URL: <http://dovecot.org/pipermail/dovecot/attachments/20170610/6c84b1e5/attachment.sig>
It looks as though there is no global mail_plugins variable. Is this the case? Or have I misunderstood how global variable are expressed? P> On 10 Jun 2017, at 9:10 pm, Peter West <lists at pbw.id.au> wrote: > > Ok, I added zlib to imap protocol. > > protocol imap { > ? > mail_plugins = $mail_plugins zlib > } > > Now both imap and lmtp protocols have zlib plugin enabled, and both send and receive mail is compressed. > > Peter > >> On 10 Jun 2017, at 6:50 pm, Aki Tuomi <aki.tuomi at dovecot.fi> wrote: >> >> Please check that you are not overwriting mail plugins for lmtp. Or post your doveconf -n. >> >> Aki >> >>> On June 10, 2017 at 11:10 AM Peter West <lists at pbw.id.au> wrote: >>> >>> >>> Not sure what you mean. I?m using lmtp to send messages to Dovecot from Postfix. >>> >>>> On 10 Jun 2017, at 6:08 pm, Aki Tuomi <aki.tuomi at dovecot.fi> wrote: >>>> >>>> What's your LDA? >>>> >>>> Aki >>>> >>>>> On June 10, 2017 at 11:01 AM Peter West <lists at pbw.id.au> wrote: >>>>> >>>>> >>>>> Thanks for that Aki. >>>>> >>>>> Follow-up question. I tried to initiate compression by adding >>>>> >>>>> mail_plugins = $mail_plugins zlib >>>>> >>>>> plugin { >>>>> zlib_save_level = 6 >>>>> zlib_save = xz >>>>> } >>>>> >>>>> >>>>> to dovecot.conf. I restarted dovecot and sent one message to the server, and one message from the server. Neither was compressed. I changed the save type to >>>>> >>>>> zlib_save = bz2 >>>>> >>>>> and repeated. This time the message received (in /var/vmail/<host>/<username>/cur) was not compressed, but the message in /var/vmail/<host>/<username>/.Sent/cur was bzip2 compressed. >>>>> >>>>> Why is the received mail not being compressed? Is this the point of the discussion about compressing old mails? >>>>> >>>>> >>>>>> On 10 Jun 2017, at 4:43 pm, Aki Tuomi <aki.tuomi at dovecot.fi> wrote: >>>>>> >>>>>> >>>>>>> On June 10, 2017 at 5:58 AM Peter West <lists at pbw.id.au> wrote: >>>>>>> >>>>>>> >>>>>>> Concerning Maildir, the wiki page on compression has this: >>>>>>> >>>>>>> All mails must have ,S=<size> in their filename where <size> contains the original uncompressed mail size, otherwise there will be problems with quota calculation as well as other potential random failures. Note that if the filename doesn?t contain the ,S=<size> before compression, adding it afterwards changes the base filename and thus the message UID. The safest thing to do is simply to not compress such files. >>>>>>> >>>>>>> Further down on the same page is this: >>>>>>> >>>>>>> If the file does exist, rename() (mv) the compressed file over the original file. >>>>>>> ? Dovecot can now read the file, but to avoid compressing it again on the next run, you'll probably want to rename it again to include e.g. a "Z" flag in the file name to mark that it was compressed (e.g. 1223212411.M907959P17184.host,S=3271:2,SZ). >>>>>>> >>>>>>> These comments seem to contradict each. Or is there a difference between adding the size specifier to the filename and adding a Z flag to the end of the file name? >>>>>>> >>>>>>> -- >>>>>>> Peter West >>>>>>> pbw at pbw.id.au >>>>>>> And the great throng heard him gladly. >>>>>>> >>>>>> >>>>>> Keyword is 'base filename'. From the wiki, "The standard filename definition is: "<base filename>:2,<flags>".". Z is a flag. >>>>>> >>>>>> Aki >>>>> >>> >-------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 235 bytes Desc: Message signed with OpenPGP URL: <http://dovecot.org/pipermail/dovecot/attachments/20170611/6ddda947/attachment.sig>
There is global mail_plugins variable, you just have to be careful not to overwrite it somewhere. Aki> On June 11, 2017 at 2:46 PM Peter West <lists at pbw.id.au> wrote: > > > It looks as though there is no global mail_plugins variable. Is this the case? Or have I misunderstood how global variable are expressed? > > P > > > On 10 Jun 2017, at 9:10 pm, Peter West <lists at pbw.id.au> wrote: > > > > Ok, I added zlib to imap protocol. > > > > protocol imap { > > ? > > mail_plugins = $mail_plugins zlib > > } > > > > Now both imap and lmtp protocols have zlib plugin enabled, and both send and receive mail is compressed. > > > > Peter > > > >> On 10 Jun 2017, at 6:50 pm, Aki Tuomi <aki.tuomi at dovecot.fi> wrote: > >> > >> Please check that you are not overwriting mail plugins for lmtp. Or post your doveconf -n. > >> > >> Aki > >> > >>> On June 10, 2017 at 11:10 AM Peter West <lists at pbw.id.au> wrote: > >>> > >>> > >>> Not sure what you mean. I?m using lmtp to send messages to Dovecot from Postfix. > >>> > >>>> On 10 Jun 2017, at 6:08 pm, Aki Tuomi <aki.tuomi at dovecot.fi> wrote: > >>>> > >>>> What's your LDA? > >>>> > >>>> Aki > >>>> > >>>>> On June 10, 2017 at 11:01 AM Peter West <lists at pbw.id.au> wrote: > >>>>> > >>>>> > >>>>> Thanks for that Aki. > >>>>> > >>>>> Follow-up question. I tried to initiate compression by adding > >>>>> > >>>>> mail_plugins = $mail_plugins zlib > >>>>> > >>>>> plugin { > >>>>> zlib_save_level = 6 > >>>>> zlib_save = xz > >>>>> } > >>>>> > >>>>> > >>>>> to dovecot.conf. I restarted dovecot and sent one message to the server, and one message from the server. Neither was compressed. I changed the save type to > >>>>> > >>>>> zlib_save = bz2 > >>>>> > >>>>> and repeated. This time the message received (in /var/vmail/<host>/<username>/cur) was not compressed, but the message in /var/vmail/<host>/<username>/.Sent/cur was bzip2 compressed. > >>>>> > >>>>> Why is the received mail not being compressed? Is this the point of the discussion about compressing old mails? > >>>>> > >>>>> > >>>>>> On 10 Jun 2017, at 4:43 pm, Aki Tuomi <aki.tuomi at dovecot.fi> wrote: > >>>>>> > >>>>>> > >>>>>>> On June 10, 2017 at 5:58 AM Peter West <lists at pbw.id.au> wrote: > >>>>>>> > >>>>>>> > >>>>>>> Concerning Maildir, the wiki page on compression has this: > >>>>>>> > >>>>>>> All mails must have ,S=<size> in their filename where <size> contains the original uncompressed mail size, otherwise there will be problems with quota calculation as well as other potential random failures. Note that if the filename doesn?t contain the ,S=<size> before compression, adding it afterwards changes the base filename and thus the message UID. The safest thing to do is simply to not compress such files. > >>>>>>> > >>>>>>> Further down on the same page is this: > >>>>>>> > >>>>>>> If the file does exist, rename() (mv) the compressed file over the original file. > >>>>>>> ? Dovecot can now read the file, but to avoid compressing it again on the next run, you'll probably want to rename it again to include e.g. a "Z" flag in the file name to mark that it was compressed (e.g. 1223212411.M907959P17184.host,S=3271:2,SZ). > >>>>>>> > >>>>>>> These comments seem to contradict each. Or is there a difference between adding the size specifier to the filename and adding a Z flag to the end of the file name? > >>>>>>> > >>>>>>> -- > >>>>>>> Peter West > >>>>>>> pbw at pbw.id.au > >>>>>>> And the great throng heard him gladly. > >>>>>>> > >>>>>> > >>>>>> Keyword is 'base filename'. From the wiki, "The standard filename definition is: "<base filename>:2,<flags>".". Z is a flag. > >>>>>> > >>>>>> Aki > >>>>> > >>> > > >