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  4. Technical Email Information for IT Staff

Technical Email Information for IT Staff

What are the URLs and IP addresses of our mailservers?

Outgoing SMTP Servers

URLIP Address


URLIP Address

The transactional email server is used for password resets, system notifications, and similar types of email.

These servers are on the allow lists and registered in feedback loops with major providers such as Hotmail, Yahoo and AOL in accordance with bulk-sending best practices. We also continuously monitor the sending reputation of these servers to ensure optimal delivery. 

If possible, it is recommended that you add our outbound mail servers to your allow list to ensure deliverability. These are dedicated IP addresses that are used for the sole purpose of sending mail from our application (we do not send any form of advertising or marketing mails from these servers). 

What is volunteer2mail.com?

volunteer2mail.com is a dedicated domain used to send emails from the Better Impact family of products 

What do we do to ensure mail deliverability?

We support SPF, Sender ID, DKIM and DomainKeys for email being sent from the volunteer2mail.com domain.

Our mail server is on the allow lists and registered in feedback loops with major providers such as Hotmail, Yahoo, AOL and Comcast.

What “Return-Path” header value are our messages sent with?


How are bounces processed?

We utilize a custom service to process and send notifications of bounces that are received at bounce@volunteer2mail.com to notify the original sender of the bounce; this is done in accordance with recommended SPF guidelines 

What do our email headers look like?

When we send mail through our service, the headers are as follows: 

Return-Path: <bounce@volunteer2mail.com> 

From: “Your Name” <you@yourdomain.com> 

To: “Recipient Name” <recipient@theirdomain.com> 

Under some circumstances, to ensure deliverability, we need to use the following headers to send the mail instead (note the addition of the “Reply-To” header and the use of “message@volunteer2mail.com” in the “From” header): 

Return-Path: <bounce@volunteer2mail.com> 

From: “Your Name” <message@volunteer2mail.com> 

Reply-To: “Your Name” <you@yourdomain.com> 

To: “Recipient Name” <recipient@theirdomain.com> 

Reasons why this is done are as follows: 

  • The sender’s domain contains a DMARC (link to: https://dmarc.org/) record with a policy of either: “reject” or “quarantine”. 
  • We detect (via an MX lookup) that the sender’s email is being hosted in Office 365. This is done to avoid message such as “This Sender Failed Our Fraud Detection Checks and May Not Be Who They Appear to Be” from showing to your recipients. 
  • We detect a TXT record in the sender’s domain with the value of “_betterimpact-rewrite-sender”. Note: this can be used to force the use of a “Reply-To” header for your domain in circumstances where the “From” header would cause issues with fraud detection / spoofing in your email environment. 

Typical Email Header Text (for reference purposes) 

Return-Path: <bounce@volunteer2mail.com> 
Received: from [] ([] 
helo=outbound.volunteer2mail.com) by smtp51.gate.dfw1a.rsapps.net 
(envelope-from <bounce@volunteer2mail.com>) (ecelerity r(37554)) 
with ESMTP id 2F/94-09431-B184BFD4; Fri, 17 Jun 2011 08:27:07 -0400 
DKIM-Signature: v=1; a=rsa-sha1; c=relaxed/relaxed; 
DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; 
Received: from mail pickup service by outbound.volunteer2mail.com with Microsoft SMTPSVC; 
Fri, 17 Jun 2011 08:27:06 -0400 
From: <johndoe@example.com> 
To: <janedoe@example.com> 
Date: Fri, 17 Jun 2011 08:24:46 -0400 
Subject: Subject 
MIME-Version: 1.0 
Content-Type: multipart/alternative; 
X-Mailer: aspNetEmail ver 
Message-ID: <vol2web1697b83fd01bc4e819c576c84dfeccf4e@vol2web1> 

Updated on April 16, 2024

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