Email Sending from VoxSTRUCTURE Servers

Voxel's on-demand infrastructure, including automatically deployed VoxCLOUD andVoxSERVER servers, come with a default ACL that blocks outbound email. Although Voxel firmly believes in providing our customers with unrestricted access to all Internet destinations, the sending of spam through mass-emailing or exploited software is a major concern for cloud-based infrastructure. As such, Voxel provides a free, easy-to-use SMTP service for our VoxSTRUCTURE customers. This SMTP service is rate limited for light email sending and can be used with confidence to send notices from your server or applications. Mass emailing is not permitted and the rate limits are in effect on a per customer basis to prevent heavy use.

How to Use the Voxel Courtesy SMTP Service

Customers can relay via cust-smtp.lga6.us.voxel.net (208.122.51.54). It will accept any message to any destination from your Voxel IP space. Connections are limited to 2 client connections at any given time with a maximum of 6 connections per minute.

What if I need to send more email?

Voxel does support direct sending from our servers, but this requires a Voxel engineer to approve your account and adjust the ACLs across your infrastructure. Please contactsupport@voxel.net to request the default ACL to be adjusted.

MTA Configuration Examples

Postfix:

Edit /etc/postfix/main.cf, and add or edit this line: relayhost = cust-smtp.lga6.us.voxel.net 

Restart Postfix for the changes to take affect.

Sendmail:

Edit /etc/mail/sendmail.mc and add or edit this line: define(`SMART_HOST', `cust-smtp.lga6.us.voxel.net') 

Rebuild the sendmail configuration using the makefile or by running m4 /etc/mail/sendmail.mc > /etc/mail/sendmail.cf 

Then restart sendmail for the changes to take affect.  You may need to first install m4 by running: yum install m4

Qmail:

Edit /var/qmail/control/smtproutes and add this line: :cust-smtp.lga6.us.voxel.net 

Restart qmail for the changes to take affect.