Virtual domains + address rewriting + transport ?
Good day. I am have spent spent some time trying to figure out if the following Postfix config is possible and am hoping for some guidance. Short Synopsis: I would like to move some of my virtual domains to have their email hosted via a Google for Domains account. While there are only a handful of accounts, most of the accounts have many aliases and have used '-' as a recipient delimiter for years. As such, the actual number of addresses is probably in the thousands. Since Google uses '+' as the recipient delimiter, there is no easy way to just switch the domains over. I would like to use my Postfix server to filter / rewrite incoming addresses and then relay them on to Google, with my server being the MX server for the domain and using a smtp transport entry to direct the messages to the right place. Long Synopsis: I currently have several virtual domains setup similar to: example.com example.com m...@example.comlastname1 f...@example.comlastname1 b...@example.comlastname1 b...@example.comlastname2 b...@example.comlastname3 where my aliases are like: lastname1 /var/boxes/lastname1/ lastname2 lastna...@example.org lastname3 /var/boxes/lastname3/, lastna...@example.org Since my recipient_delimeter is set to '-', this allows emails addressed to: me-...@example.com bill-baz-...@example.com to get to the right account. I am trying to get rid of all local delivery and have this machine just act a gateway that does some basic address filtering and routes the email to the new email server (Google for Domains). For example, this server would know that 'm...@example.com', 'f...@example.com' 'b...@example.com ', and 'me-anyth...@example.com' should all be relayed to 'lastna...@example.com ' at Google. While I realize this doesn't work, imagine that I updated aliases to: lastname1 lastna...@example.com and make a transport entry: example.com smtp:[newserver.example.google.com] and you hopefully can get an idea of what I am trying to do. Is something like this possible with Postfix? Thanks.
Re: Virtual domains + address rewriting + transport ?
Tony Demark: Good day. I am have spent spent some time trying to figure out if the following Postfix config is possible and am hoping for some guidance. Short Synopsis: I would like to move some of my virtual domains to have their email hosted via a Google for Domains account. While there are only a handful of accounts, most of the accounts have many aliases and have used '-' as a recipient delimiter for years. As such, the actual number of addresses is probably in the thousands. Since Google uses '+' as the recipient delimiter, there is no easy way to just switch the domains over. I would like to use my Postfix server to filter / rewrite incoming addresses and then relay them on to Google, with my server being the MX server for the domain and using a smtp transport entry to direct the messages to the right place. http://www.postfix.org/virtual.5.html http://www.postfix.org/pcre_table.5.html Wietse
Re: Virtual domains + address rewriting + transport ?
On Feb 8, 2009, at 2:31 PM, Wietse Venema wrote: Tony Demark: I would like to move some of my virtual domains to have their email hosted via a Google for Domains account. While there are only a handful of accounts, most of the accounts have many aliases and have used '-' as a recipient delimiter for years. As such, the actual number of addresses is probably in the thousands. Since Google uses '+' as the recipient delimiter, there is no easy way to just switch the domains over. I would like to use my Postfix server to filter / rewrite incoming addresses and then relay them on to Google, with my server being the MX server for the domain and using a smtp transport entry to direct the messages to the right place. http://www.postfix.org/virtual.5.html http://www.postfix.org/pcre_table.5.html I tried PCREs at one point, and got close, but I kept hitting a wall that original left hand side of the address would get relayed to the new server, as opposed to the one that was specified in the virtual table. For example: virtural_regex: /^(.*?)-(.*)@example.com$/$...@example.com If the original server gets an email addressed to 'me- foo...@example.com', I need the email to be relayed to 'm...@example.com', not 'me-foo...@example.com'. Thanks.
Re: Virtual domains + address rewriting + transport ?
Tony Demark: On Feb 8, 2009, at 2:31 PM, Wietse Venema wrote: Tony Demark: I would like to move some of my virtual domains to have their email hosted via a Google for Domains account. While there are only a handful of accounts, most of the accounts have many aliases and have used '-' as a recipient delimiter for years. As such, the actual number of addresses is probably in the thousands. Since Google uses '+' as the recipient delimiter, there is no easy way to just switch the domains over. I would like to use my Postfix server to filter / rewrite incoming addresses and then relay them on to Google, with my server being the MX server for the domain and using a smtp transport entry to direct the messages to the right place. http://www.postfix.org/virtual.5.html http://www.postfix.org/pcre_table.5.html I tried PCREs at one point, and got close, but I kept hitting a wall that original left hand side of the address would get relayed to the new server, as opposed to the one that was specified in the virtual table. For example: virtural_regex: /^(.*?)-(.*)@example.com$/$...@example.com If the original server gets an email addressed to 'me- foo...@example.com', I need the email to be relayed to 'm...@example.com', not 'me-foo...@example.com'. /^(.+)(-.+)?...@example\.com$/$...@example.com Wietse
Re: Virtual domains + address rewriting + transport ?
On Feb 8, 2009, at 4:23 PM, Wietse Venema wrote: Tony Demark: On Feb 8, 2009, at 2:31 PM, Wietse Venema wrote: Tony Demark: I would like to move some of my virtual domains to have their email hosted via a Google for Domains account. While there are only a handful of accounts, most of the accounts have many aliases and have used '-' as a recipient delimiter for years. As such, the actual number of addresses is probably in the thousands. Since Google uses '+' as the recipient delimiter, there is no easy way to just switch the domains over. I would like to use my Postfix server to filter / rewrite incoming addresses and then relay them on to Google, with my server being the MX server for the domain and using a smtp transport entry to direct the messages to the right place. http://www.postfix.org/virtual.5.html http://www.postfix.org/pcre_table.5.html I tried PCREs at one point, and got close, but I kept hitting a wall that original left hand side of the address would get relayed to the new server, as opposed to the one that was specified in the virtual table. For example: virtural_regex: /^(.*?)-(.*)@example.com$/$...@example.com If the original server gets an email addressed to 'me- foo...@example.com', I need the email to be relayed to 'm...@example.com', not 'me-foo...@example.com'. /^(.+)(-.+)?...@example\.com$/$...@example.com OK ... I think I got this figured out. It ended up that the searches I was referencing for configuration were from 2002 ... things have changed somewhat since then. Combine that with a typo in a file name and things really start not adding up. I started fresh with an unused domain, used only the official docs, and got it working. Sometimes you end up so far down the wrong path, it's hard to comprehend just how far you have to backtrack to right yourself, even if you have access to the best and brightest! Thanks for the help.
Re: Virtual domains + address rewriting + transport ?
Tony Demark a écrit : On Feb 8, 2009, at 2:31 PM, Wietse Venema wrote: Tony Demark: I would like to move some of my virtual domains to have their email hosted via a Google for Domains account. While there are only a handful of accounts, most of the accounts have many aliases and have used '-' as a recipient delimiter for years. As such, the actual number of addresses is probably in the thousands. Since Google uses '+' as the recipient delimiter, there is no easy way to just switch the domains over. I would like to use my Postfix server to filter / rewrite incoming addresses and then relay them on to Google, with my server being the MX server for the domain and using a smtp transport entry to direct the messages to the right place. http://www.postfix.org/virtual.5.html http://www.postfix.org/pcre_table.5.html I tried PCREs at one point, and got close, but I kept hitting a wall that original left hand side of the address would get relayed to the new server, as opposed to the one that was specified in the virtual table. For example: virtural_regex: /^(.*?)-(.*)@example.com$/$...@example.com If the original server gets an email addressed to 'me-foo...@example.com', I need the email to be relayed to 'm...@example.com', not 'me-foo...@example.com'. you can test lookups using 'postmap -q'. /^(me)-...@example\.com$/ m...@example.com do this for all valid addresses. If you use a wildcard like /^([^-]+)-...@example\.com$/$...@example.com you will break recipient validation and your postfix will accept mail for any doesnotexist-ran...@example.com.
Re: Virtual domains + address rewriting + transport ?
Tony Demark: If the original server gets an email addressed to 'me- foo...@example.com', I need the email to be relayed to 'm...@example.com', not 'me-foo...@example.com'. /^(.+)(-.+)?...@example\.com$/$...@example.com OK ... I think I got this figured out. It ended up that the searches I was referencing for configuration were from 2002 ... things have changed somewhat since then. Combine that with a typo in a file name and things really start not adding up. I started fresh with an unused domain, used only the official docs, and got it working. Sometimes you end up so far down the wrong path, it's hard to comprehend just how far you have to backtrack to right yourself, even if you have access to the best and brightest! To make this work without false matches, you will need to enumerate the user names. /^(user1|user2|user3)(-.+)?...@example\.com$/$...@example.com /^(user4|user5|user6)(-.+)?...@example\.com$/$...@example.com False positives will cause your machine to accept spam, find out that Google rejects the non-existent username, and then your Postfix will try to return the spam to people who did not send it. Wietse
Re: Virtual domains + address rewriting + transport ?
On Feb 8, 2009, at 6:10 PM, Wietse Venema wrote: To make this work without false matches, you will need to enumerate the user names. /^(user1|user2|user3)(-.+)?...@example\.com$/$...@example.com /^(user4|user5|user6)(-.+)?...@example\.com$/$...@example.com False positives will cause your machine to accept spam, find out that Google rejects the non-existent username, and then your Postfix will try to return the spam to people who did not send it. I have the Google account set to silently drop any email whose address doesn't exist. Not nearly as good as killing the message during the initial conversation, but at least there is no backscatter. Once things settle down a little, I'll probably go back and enumerate the user names. Thanks.
