Author: Dawit Gebru

How do I increase the maximum email size in postfix?

The postfix MTA is configured by default with resource limits that safeguard the stability of the server. One such parameter is the maximum email size, which is configured to approximately 10 MB by default. If you need to send emails larger than 10 MB:

  • Backup the /etc/postfix/main.cf configuration file
  • Edit the /etc/postfix/main.cf configuration file
  • Add a line to the bottom of the file with the desired new size. For example, if you wish to increase the size to approximately 25 MB:
message_size_limit = 25000000
  • Save the file
  • Reload sendmail
service postfix reload

For more information, please refer to the postfix documentation.

How do I set the IP address on my DIGI LAN server?

NOTE: these steps must be performed on the same LAN as the device.

  • Record the MAC address of the Digi device (located on the label side (bottom) of the unit)
  • Manually update the workstation’s ARP table using the Digi device’s MAC using one of the commands below, substituting the new Digi’s IP address and MAC address:
arp -s 192.168.2.2 00-00-9d-22-23-60
arp -s 192.168.2.2 00009d222360
  • Ping the Digi device using the IP address just assigned:
ping 192.168.2.2
  • When the Digi begins responding to pings, enter the IP into a web browser and login (user/pass root/dbps) to set the default gateway and subnet mask
  • Add to the digi device IP address to the /etc/hosts file 
    vi /etc/hosts
192.168.2.2 digi
  • Notify Eclipse that the Digi is online by updating your service request online with the Digi IP address
  • Eclipse will verify connectivity to the Dig and continue the VSIFAX configuration process

How do I forward root’s mail to another email address?

It may be useful to create an alias for the root user’s email address, so that another user or group of users receives important system messages.

  • Open the /etc/aliases file for editing
vim /etc/aliases
  • Append a line to the bottom redirecting mail to an external email address
root:           dawit. gebru @epicor.com
  • Refresh the aliases database
newaliases