resources for 'only virtual domains'

2 msg	hash table not matching subdomains
18 msg	Non-delivery problem
3 msg	tracing mail
5 msg	different SMTP ip sender in one instance of pos...
18 msg	Three Postfix Errors
10 msg	Conditional relay to a barracuda spam filter
2 msg	Postfix as honeypot
3 msg	postqueue -p
17 msg	Patch to pas all the recipients of a mail to th...
5 msg	Postfix DBD Help
4 msg	Send and receive mail on different ports?
3 msg	postfix behind a router
1 msg	postfix to access mail from external host.
4 msg	Three installation/configuration issues
9 msg	Reject SMTP connection if two RBL match
3 msg	Holding Large Emails
9 msg	Monitor Relaying
7 msg	Sender address rejected when sending messages t...
1 msg	Problem using Postfix with LDAP using STARTTLS

resources for 'only virtual domains'
\ Stefan Palme (15 Nov 2007)
. \ (Wietse Venema) (15 Nov 2007)
. . \ Stefan Palme (15 Nov 2007)
. . . \ (Wietse Venema) (15 Nov 2007)
. . . . \ Stefan Palme (16 Nov 2007)
. . \ Jorey Bump (15 Nov 2007)
. . . \ Victor Duchovni (15 Nov 2007)

Subject:	resources for 'only virtual domains'
Group:	Postfix-users
From:	Stefan Palme
Date:	15 Nov 2007

Hi,

I have a postfix setup with a lot of virtual domains (using
virtual_alias_domains and virtual_alias_maps). I have set

mailbox_transport = lmtp:unix:/var/imap/socket/lmtp

so that all mail will be stored in a locally running IMAP server.

None of the "virtual users" has a real unix account on this server,
so no one can create a .forward file (the only users with real unix
accounts are from the mydestination-domain, which is only me :-)

The default settings for local_destination_{concurrency,recipient}_limit
is {2,1}. The documentation explains this with

"A low limit of 2 is recommended, just in case someone has an
expensive shell command in a .forward file or in an alias (e.g., a
mailing list manager). You don't want to run lots of those at the
same time."

Since I do not have any local mailbox files (which could cause trouble
with locking issues) and no .forward files (which could cause
performance problems) I think I could raise these values to e.g.
{20,50}.

Are there any other things I should take into account before raising
these limit values?

Thanks and regards
-stefan-