Two virtual domains
in [Postfix]
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From: Oleksii Krykun on 16 Mar 2010 05:29 I have two virtual domains, e.g. domain1 and domain2 And I have user1(a)domain1, user2(a)domain1 and user3(a)domain2, user4(a)domain2. Now I need to receive all mail to user1(a)domain2 into user1(a)domain1 mailbox, user2(a)domain2 ->user2(a)domain1 and user3(a)domain1->user3(a)domain2, user4(a)domain1->user4(a)domain2. I set up two domain aliases: @domain1 @domain2 and @domain2 @domain1 All works fine. But if I send message to non-existent mailbox (e.g. user5(a)domain1) I receive true NDR but get following warning: Mar 16 10:43:07 mail postfix/cleanup[28954]: warning: F41F4B82A: unreasonable virtual_alias_maps map nesting for user5(a)domain1. Is this a serious problem? How to resolve it? Thanks, Oleksii
From: Ansgar Wiechers on 16 Mar 2010 07:02 On 2010-03-16 Oleksii Krykun wrote: > I have two virtual domains, e.g. domain1 and domain2 > And I have user1(a)domain1, user2(a)domain1 and user3(a)domain2, user4(a)domain2. > Now I need to receive all mail to user1(a)domain2 into user1(a)domain1 mailbox, > user2(a)domain2 ->user2(a)domain1 > and > user3(a)domain1->user3(a)domain2, user4(a)domain1->user4(a)domain2. > > I set up two domain aliases: > @domain1 @domain2 > and > @domain2 @domain1 This makes you a backscatterer, because Postfix will accept all mail for both domain1 and domain2 and create bounces if both local delivery and forwarding to the other domain fails. Don't do that. Ever. > All works fine. But if I send message to non-existent mailbox (e.g. > user5(a)domain1) I receive true NDR but get following warning: > > Mar 16 10:43:07 mail postfix/cleanup[28954]: warning: F41F4B82A: > unreasonable virtual_alias_maps map nesting for user5(a)domain1. > > Is this a serious problem? Yes. > How to resolve it? Make the virtual aliases explicit. ----8<---- user1(a)domain2 user1(a)domain1 user2(a)domain2 user2(a)domain1 user3(a)domain1 user3(a)domain2 user4(a)domain1 user4(a)domain2 ---->8---- And make sure the mailboxes do exist. Regards Ansgar Wiechers -- "Abstractions save us time working, but they don't save us time learning." --Joel Spolsky
From: Oleksii Krykun on 16 Mar 2010 07:48 2010/3/16 Ansgar Wiechers <lists(a)planetcobalt.net> > > On 2010-03-16 Oleksii Krykun wrote: > > I have two virtual domains, e.g. domain1 and domain2 > > And I have user1(a)domain1, user2(a)domain1 and user3(a)domain2, user4(a)domain2. > > Now I need to receive all mail to user1(a)domain2 into user1(a)domain1 mailbox, > > user2(a)domain2 ->user2(a)domain1 > > and > > user3(a)domain1->user3(a)domain2, user4(a)domain1->user4(a)domain2. > > > > I set up two domain aliases: > > @domain1 @domain2 > > and > > @domain2 @domain1 > > This makes you a backscatterer, because Postfix will accept all mail for > both domain1 and domain2 and create bounces if both local delivery and > forwarding to the other domain fails. I don't see any difference between one or two domains here. For one domain if local delivery fails Postfix will create bounces too. > > Don't do that. Ever. > > > All works fine. But if I send message to non-existent mailbox (e.g. > > user5(a)domain1) I receive true NDR but get following warning: > > > > Mar 16 10:43:07 mail postfix/cleanup[28954]: warning: F41F4B82A: > > unreasonable virtual_alias_maps map nesting for user5(a)domain1. > > > > Is this a serious problem? > > Yes. Why? > > > How to resolve it? > > Make the virtual aliases explicit. > > ----8<---- > user1(a)domain2 user1(a)domain1 > user2(a)domain2 user2(a)domain1 > user3(a)domain1 user3(a)domain2 > user4(a)domain1 user4(a)domain2 > ---->8---- > I have more than 4 mailboxes. :-) Does another solution exist? > And make sure the mailboxes do exist. >
From: Noel Jones on 16 Mar 2010 08:28 On 3/16/2010 6:48 AM, Oleksii Krykun wrote: > 2010/3/16 Ansgar Wiechers<lists(a)planetcobalt.net> >>> All works fine. But if I send message to non-existent mailbox (e.g. >>> user5(a)domain1) I receive true NDR but get following warning: >>> >>> Mar 16 10:43:07 mail postfix/cleanup[28954]: warning: F41F4B82A: >>> unreasonable virtual_alias_maps map nesting for user5(a)domain1. >>> >>> Is this a serious problem? >> >> Yes. > > Why? > >> >>> How to resolve it? >> >> Make the virtual aliases explicit. >> >> ----8<---- >> user1(a)domain2 user1(a)domain1 >> user2(a)domain2 user2(a)domain1 >> user3(a)domain1 user3(a)domain2 >> user4(a)domain1 user4(a)domain2 >> ---->8---- Yes, this is the correct solution. >> > > I have more than 4 mailboxes. :-) > Does another solution exist? Use your scripting skills to create the list. The number of entries in the list is largely irrelevant for performance. BDB hash tables scale well to a few million entries, although rebuilding can take a while. If that's not good enough, use cdb up to OS file size limits. -- Noel Jones
From: Oleksii Krykun on 16 Mar 2010 08:41 2010/3/16 Noel Jones <njones(a)megan.vbhcs.org>: > On 3/16/2010 6:48 AM, Oleksii Krykun wrote: >> >> 2010/3/16 Ansgar Wiechers<lists(a)planetcobalt.net> >>>> >>>> All works fine. But if I send message to non-existent mailbox (e.g. >>>> user5(a)domain1) I receive true NDR but get following warning: >>>> >>>> Mar 16 10:43:07 mail postfix/cleanup[28954]: warning: F41F4B82A: >>>> unreasonable virtual_alias_maps map nesting for user5(a)domain1. >>>> >>>> Is this a serious problem? >>> >>> Yes. >> >> Why? >> >>> >>>> How to resolve it? >>> >>> Make the virtual aliases explicit. >>> >>> ----8<---- >>> user1(a)domain2 user1(a)domain1 >>> user2(a)domain2 user2(a)domain1 >>> user3(a)domain1 user3(a)domain2 >>> user4(a)domain1 user4(a)domain2 >>> ---->8---- > > Yes, this is the correct solution. In future both domain users will migrate to one of them. I think to use explicit aliasing in one direction and global aliasing in another. Is it bad? > >>> >> >> I have more than 4 mailboxes. :-) >> Does another solution exist? > > Use your scripting skills to create the list. The number of entries in the > list is largely irrelevant for performance. BDB hash tables scale well to a > few million entries, although rebuilding can take a while. If that's not > good enough, use cdb up to OS file size limits. > > -- Noel Jones >
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