POP3 Connector / POP3 Gateway for Microsoft Exchange 2013 and
Microsoft Exchange 2016
Be sure to use PYTHEAS MailGate v.2.72 or later. PYTHEAS MailGate will interact
with a Microsoft Exchange 2013 or Microsoft Exchange 2016 server with the Client Access role.
Configure incoming mail flow
1. Connections to the existing Receive Connector
PYTHEAS MailGate downloads messages from a POP3 mailbox and sends them to the "Default Frontend <nom du serveur>"
2. Allow incoming messages sent to your messaging domain
In the Microsoft Exchange 2013 / 2016 Admin Center, go to Mail flow / accepted Domains.
- If you have your own messaging domain (like company.com): if you
see it in the list, skip the rest of this section. If you don't, add your
messaging domain to the list: click on + and create a Authoritative Domain
for your messaging domain.
- If you do not have your own messaging domain (i.e. your users have
email addresses like email@example.com), add a Internal
relay domain for the
3. Other settings you may want to check
By default, spam-filtering is not installed. In this case
you may skip this section. However, if
spam filtering is installed, and you want to use the Microsoft Exchange 2013 /
spam filtering capacities, make
sure that messages recognized as spam are always accepted (in the
ContentFilterConfig, set the
SCLRejectEnabled parameter to
false). Beginning with v. 2.74, you may also
proceed as described here.
Maximum message size
By default, the Exchange Receive Connector accepts messages with a maximum size
of 35 MB. PYTHEAS MailGate will get the maximum message size and will not
try to download messages over size. You may want to read
Configure outgoing mail flow
If you do not want PYTHEAS MailGate take care of outgoing email, you may skip
this section and organize outgoing mail flow according to your requirements in
Microsoft Exchange 2013 / 2016. On the other hand, if you want PYTHEAS MailGate take
care of outgoing mail, please do the following:
Create a new Send Connector
- If you already have a Send Connector to send email to the Internet, you
may consider removing it and create a new one, or modify it according to the
- In the Microsoft Exchange 2013 Admin center, go to
Mail flow / Send Connectors. If the list is empty,
create a new Send Connector with the following characteristics:
- Name: ToPytheasMailgate (you can choose any name);
- Type: Custom;
- Network settings: choose Route mail through the
following smart hosts, then click +, then add the IP
address of the machine which will be running the PYTHEAS MailGate
Communication Task to the list
. You may use 127.0.0.1 if it's on the same machine.
Leave the Use the External DNS Lookup settings on the transport
server box unchecked.
- Smart host authentication: choose None
- Address spaces: click + then enter * (a
single asterisk) as the domain name
- Source Server: click + and add your server to
- If both Microsoft Exchange 2013 / 2016 and PYTHEAS MailGate run on the same
machine, you will need to change the outgoing SMTP port of the Send Connector:
- Open the Microsoft Exchange Server 2013 / 2016 Management Shell from the Start
- Paste the command
Set-SendConnector -identity "ToPytheasMailgate" -Port:2500
into the management shell window, and execute it. This will change
to outgoing SMTP port to 2500.
- You may check the new configuration with the following command:
Get-SendConnector -identity "ToPytheasMailgate" | Format-List
giving the following result:
: 35 MB (36,700,160 bytes)
SmartHostAuthMechanism : None
SmtpMaxMessagesPerConnection : 20
UseExternalDNSServersEnabled : False
- By default, the Exchange 2013 / 2016 Admin Center sets a maximum
message size of 35MB for outgoing messages through this send connector ;
you can change this limit in the graphical user interface.
Limit de number of outgoing connections
- In the Microsoft Exchange 2013 / 2016 Admin Center, go to Servers,
select your server, and open its properties / Transport
Limits. In Outbound connection restrictions, set both the Maximum concurrent
connections and the Maximum concurrent connections
per domain to 1.