We are seeing messages that ISendEmail is now obsolete in our code after upgrading to 12.1.3. I don't see any update/notice about this code being obsolete. What are we supposed to use now? This worked fine in 12.0.6.

We are seeing messages that ISendEmail is now obsolete in our code after upgrading to 12.1.3. I don't see any update/notice about this code being obsolete. What are we supposed to use now? This worked fine in 12.0.6.

We have not yet updated the documentation for 12.1 as of yet. The addition of the new API was included in the release notes. The definition outside of the documentation would be available via intellisense or it will be in teh autopmation/widget studio documentation
I should also point out obsolete does not mean non-functional. It simply means its been replaced with a newer version, the older version remains and is functional and remains that way for at least 2 versions by our current deprecation cycle. It means no new development should use it and older usages should be updated as soon as feasible.