SPF
To authorize Apptoto to send emails on your behalf you will have to manually add it to your SPF record. The SPF record mechanism used for Apptoto is as follows:
a:mailers.apptoto.com
DKIM
Apptoto also support DKIM signing, in order to enable it please contact their support team here: [email protected] and request DKIM to be enabled for you custom domain.
Check if DKIM is configured correctly
Why not use our free Investigate tool to swiftly verify your DKIM configuration.
Create a free OnDMARC account to test your configuration.