how to configure mailertable
in [Sendmail]
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From: Kendall Carpenter on 12 Apr 2005 16:34 Hello, I have researched into how to configure the mailertable, but would like some help confirming the process before I begin. Also, if you could tell me if it is possible to undo this process that would be helpful. I am trying to have email from a local (private ip) SMTP server delivered to a local (private ip) pop server. This way I can eliminate a private RFC1918 non-compliant ip address in my external DNS servers MX records. Would anyone be willing to look over my checklist items and confirm my thinking and/or the steps? Thanks in advance. What I think I might have to do is this: (1.) Check to be certain sendmail is setup to use mailertable, which might require a sendmail.mc file; but I do not seem to have a sendmail.mc file. I think I am using sendmail v8.11. However, if i grep for mailertable in /etc/sendmail.cf I get the following: ##### $Id: mailertable.m4,v 8.18 1999/07/22 17:55:35 gshapiro Exp $ ##### Kmailertable hash -o /etc/mail/mailertable.db R< $+ > $* $: < $(mailertable $1 $) > $2 lookup ### Ruleset 90 -- try domain part of mailertable entry ### R$* <$- . $+ > $* $: $1$2 < $(mailertable .$3 $@ $1$2 $@ $2 $) > $4 R$* < $* > $* $: < $(mailertable . $@ $1$2 $) > $3 try "." R< $* > $* $@ $2 no mailertable match Does this mean I can use mailertable? BTW, there is already an /etc/mail/mailertable file. So, maybe I can just move on to step two. (2.) Next I will edit the /etc/mail/mailertable to include the line mydomain.com smtp:[10.0.0.7] In addition I can include similar lines for the other domains that now have 10.0.0.7 MX entries. My understandsing is that this will allow the SMTP server to deliver email to anyone(a)mydomain.com directly to 10.0.0.7 without querying a DNS server. Is this correct? (3.) I will have to rebuild the hash map afterwards by using the following command: /usr/sbin/makemap hash /etc/mail/mailertable.db < /etc/mail/mailertable (4.) Next I will edit /etc/mail/relay-domains and include the following line: mydomain.com In addition, I would include here all of the domains I had added to the mailertable. Then restart sendmail. As of right now, I have quite a few relay_hosts_only entries in my /etc/mail/relay-domains file. Many of these are host1.mydomain.com, host2.mydomain.com, host3.mydomain.com, etc. Would I now be able to replace all of these relay_hosts_only entries with a single 'mydoamin.com' entry? On my SMTP server, the /etc/hosts file has entries for each of host1.mydomain.com, host2.mydomain.com, host3.mydomain.com, etc. I think we did this so our local workstations and servers (with only private ip's) could use the SMTP server for relaying mail to outside our network. But it seems as though I may be able to remove these entries now. I dont think it hurts to have them there, but they would now go unused, yes? Please do not feel obligated to take lots of time to explain or teach to me how this all works. But if anyone would even just confirm the steps that I must accomplish in order for the mailertable to work that would be great. I wanted to include all this information in case it was useful. Would that be all that has to be done? Thank you for any help, Kendall
From: Per Hedeland on 15 Apr 2005 17:44 In article <425c2ee2$1(a)news2.lightlink.com> Kendall Carpenter <kmc(a)promtech.com> writes: > >I have researched into how to configure the mailertable, but would like >some help confirming the process before I begin. Also, if you could tell >me if it is possible to undo this process that would be helpful. How could it not be possible? You're only modifying files on a computer, to undo you just need to put the original versions back again (and perhaps restart a daemon or two). >(1.) Check to be certain sendmail is setup to use mailertable, which >might require a sendmail.mc file; but I do not seem to have a >sendmail.mc file. I think I am using sendmail v8.11. However, if i grep >for mailertable in /etc/sendmail.cf I get the following: > >##### $Id: mailertable.m4,v 8.18 1999/07/22 17:55:35 gshapiro Exp $ ##### >Kmailertable hash -o /etc/mail/mailertable.db >R< $+ > $* $: < $(mailertable $1 $) > $2 lookup >### Ruleset 90 -- try domain part of mailertable entry ### >R$* <$- . $+ > $* $: $1$2 < $(mailertable .$3 $@ $1$2 $@ $2 $) > $4 >R$* < $* > $* $: < $(mailertable . $@ $1$2 $) > $3 try "." >R< $* > $* $@ $2 no mailertable match > >Does this mean I can use mailertable? Seems likely - i.e. assuming your sendmail.cf was built from a .mc file at all, and not just randomly hacked. But you should really try to find the .mc file, or if it's really gone, re-create it. > BTW, there is already an >/etc/mail/mailertable file. Pretty much irrelevant. >(2.) Next I will edit the /etc/mail/mailertable to include the line > mydomain.com smtp:[10.0.0.7] >In addition I can include similar lines for the other domains that now >have 10.0.0.7 MX entries. My understandsing is that this will allow the >SMTP server to deliver email to anyone(a)mydomain.com directly to 10.0.0.7 >without querying a DNS server. Is this correct? Yes. >(3.) I will have to rebuild the hash map afterwards by using the >following command: >/usr/sbin/makemap hash /etc/mail/mailertable.db < /etc/mail/mailertable That works, but you should really drop the ".db" part. >(4.) Next I will edit /etc/mail/relay-domains and include the following >line: > mydomain.com >In addition, I would include here all of the domains I had added to the >mailertable. Then restart sendmail. This will allow relaying to destination addresses of the form user(a)mydomain.com, and possibly user@*.mydomain.com (see below), as well as relaying from hosts that have an IP address that reverse-resolves to mydomain.com, and possibly *.domain.com (see below). >As of right now, I have quite a few relay_hosts_only entries in my >/etc/mail/relay-domains file. Many of these are host1.mydomain.com, >host2.mydomain.com, host3.mydomain.com, etc. Would I now be able to >replace all of these relay_hosts_only entries with a single >'mydoamin.com' entry? There's no such thing as "relay_hosts_only entries" - the entries are what they are, relay_hosts_only is a FEATURE() that you specify in the ..mc file, that affects how entries in relay-domains (and access db) are interpreted. With relay_hosts_only, a 'mydomain.com' entry matches only the exact mydomain.com as domain-part in a recipient address or result of reverse-resolution of an IP address - without relay_hosts_only it matches also *.mydomain.com. Since we don't know what you wanted to achieve with those host1.mydomain.com etc entries, nor whether you are using relay_hosts_only, we can't tell whether a single mydomain.com entry will work as replacement. What we can say is that they have no relevance for a recipient address like user(a)mydomain.com per se, nor do they have any relation to your change from MX records to mailertable entries. So it seems that if you needed them before you will still need them, if not you won't need them in the future either. >On my SMTP server, the /etc/hosts file has entries for each of >host1.mydomain.com, host2.mydomain.com, host3.mydomain.com, etc. I think >we did this so our local workstations and servers (with only private >ip's) could use the SMTP server for relaying mail to outside our >network. But it seems as though I may be able to remove these entries >now. I dont think it hurts to have them there, but they would now go >unused, yes? Pretty much the same as above - they're certainly not needed for your mailertable entry, but maybe for something else. >Would that be all that has to be done? For routing based on mailertable instead of DNS, all that is needed is the mailertable entry in a mailertable that is actually used by sendmail. --Per Hedeland per(a)hedeland.org
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