Back to Community Threads
smtp2go
Question asked by Sabatino - 10/26/2023 at 2:57 AM
Unanswered
sorry for the ignorance.
Was trying smtp2go which I would like to use as emergency outbound gateway

But one thing isn't clear to me.

I've seen that they set a series of values on DNS but not SPF

But then the spf check passes.
Anyone have the patience to explain or can give me some references to documentation

Thank you
Sabatino Traini
      Chief Information Officer
Genial s.r.l. 
Martinsicuro - Italy
Sabatino Replied
10/30/2023 at 1:49 AM
because you are imagining a scenario where your SM installation is broken.
But this is not the only case.
Imagine that your IP is rejected by some provider, sometimes because one of your users has done something bad, but sometimes also for invalid reasons.
Look at this case for example:

I assure you he is not the only one.
In this case an outbound gateway saves you
Sabatino Traini
      Chief Information Officer
Genial s.r.l. 
Martinsicuro - Italy
Sabatino Replied
12/13/2023 at 10:41 AM
bump.
Sorry if I bring up the topic again but I'm curious.
As I told you I was trying smtp2go and to verify the sender here is what it does to set on DNS
As you can see, the spf record is not modified

But then a message sent through them passes the spf check

How do they do it?
Sabatino Traini
      Chief Information Officer
Genial s.r.l. 
Martinsicuro - Italy
Kyle Kerst Replied
12/13/2023 at 12:17 PM
Employee Post
Perhaps they do some kind of conditional SPF with variables instead of static names, then the DNS values you input above factor into whether that overriding SPF check passes or not. I'm not familiar with it but that's my theory!
Kyle Kerst
Lead Internal Network/System Administrator
SmarterTools Inc.
J
J. LaDow Replied
12/13/2023 at 1:27 PM
They send email out on a via a subdomain host on the primary domain you specify, and match the SPF and DKIM to "that subdomain host" that sends out.

We've used them for about 5 years now -- stellar service although there are some drawbacks to their UI for managing a large amount of domains.
MailEnable survivor / convert --
Sabatino Replied
12/13/2023 at 1:33 PM
Thank you
Sabatino Traini
      Chief Information Officer
Genial s.r.l. 
Martinsicuro - Italy
C
CLEBER SAAD Replied
12/14/2023 at 2:03 PM
You can create a postfix for outbound with multiples IP's

in the master.cf you can create the macros with varios bounding Ip's
In the main.cf use the sender_dependent_default_transport_maps = randmap { macros names }
will be balance the delivery.
Back to Community Threads

Reply to Thread

Enter the verification text
Related Knowledge Base Articles
SmarterMail and OAuth 2.0SmarterMail > Server Configuration and Management
Setting Up Two-Factor Authentication (2FA, MFA, etc.)SmarterMail > Desktop and Mobile Synchronization
Resolving SMTP Failures on AWS-based ServerSmarterMail > Server Configuration and Management
Key Feature and Version Milestones in SmarterMailSmarterMail
Automatic SSL Certificates on a New SmarterMail ServerSmarterMail > Server Configuration and Management