Auto-envoyer is a french first group verb. So it follow the regular conjugation pattern of the first group like:
aimer.
Follow this link to see all the endings of the conjugation of the first group verbs :
conjugation rules and endings for the first group verbs.
However, although the terminations are perfectly regular, stem can be irregular and have numerous variations.
Auto-envoyer is conjugated the same way that verbs that end in :
-oyer.
The verb
envoyer and similar verbs have irregular future and conditional tenses. The future stem of this verb is
enverr-, resembling
voir more than
envoyer. This gives the future tense
j'enverrai, tu enverras... and the conditional tense
j'enverrais, tu enverrais...