# Postfix configure question

**URL:** <https://forums.suse.com/t/postfix-configure-question/40701>\
**Category:** SUSE Linux Enterprise Server\
**Created:** [May 17, 2023, 9:36am UTC](https://forums.suse.com/t/postfix-configure-question/40701 "2023-05-17T09:36:08Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![wenchengkao](https://avatars.discourse-cdn.com/v4/letter/w/bbe5ce/32.png) [@wenchengkao](https://forums.suse.com/u/wenchengkao)\
**Post date:** [May 17, 2023, 9:36am UTC](https://forums.suse.com/t/postfix-configure-question/40701/1 "2023-05-17T09:36:08Z")

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Hi All  
I want to install a postfix server by using SLES15SP4  
and I find a useful document , although it for opensuse.

[en.opensuse.org/Mail\_server\_HOWTO](http://en.opensuse.org/Mail_server_HOWTO)

but this has some commands , I am confused.  
Question-1  
like Aliases section …it has 2 command scrip

db\_type=$(postconf default\_database\_type)  
db\_type=${db\_type##\* }

Whether I type these 2 command in linux command prompt or need vi /etc/postfix/main.cf to copy & post them ?

thanks!!

wencheng

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**Author:** ![eirikur\_ingibergsson](https://sea2.discourse-cdn.com/flex022/user_avatar/forums.suse.com/eirikur_ingibergsson/32/9925_2.png) [@eirikur\_ingibergsson](https://forums.suse.com/u/eirikur_ingibergsson)\
**Post date:** [May 18, 2023, 2:49pm UTC](https://forums.suse.com/t/postfix-configure-question/40701/2 "2023-05-18T14:49:18Z")

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> [@wenchengkao](#):
>
> wencheng

Wencheng,

> Whether I type these 2 command in linux command prompt or need vi /etc/postfix/main.cf  
> Per :  
> It also requires in /etc/postfix/main.cf an entry for sender\_canonical\_maps with the following script:  
> this means you should edit the file with vi /etc/postfix/main.cf

Rgds, Eirikur

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**Author:** ![wenchengkao](https://avatars.discourse-cdn.com/v4/letter/w/bbe5ce/32.png) [@wenchengkao](https://forums.suse.com/u/wenchengkao)\
**Post date:** [May 19, 2023, 12:00am UTC](https://forums.suse.com/t/postfix-configure-question/40701/3 "2023-05-19T00:00:08Z")

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HI @eirikur_ingibergsson  
Yesterday, I re-test this command and after run single command I run echo $db\_type to check what value.

db\_type=$(postconf default\_database\_type)  
When echo $db\_type will output “default\_database\_type = lmdb”  
db\_type=${db\_type##\* }  
This time echo $db\_type will output “lmdb”  
So these commands go get DB type to be use by next command  
postconf “sender\_canonical\_maps = ${db\_type}:/etc/postfix/sender\_canonical”

it will change to sender\_canonical\_maps = lmdb:/etc/postfix/sender\_canonica

Wencheng