Avisfirst mail avisa

It seems like you're trying to send a message in Morse code!

Here's the translation:

avisfirst mail avisa

In Morse code, this translates to:

.-..- -.-. --..- -. -.-. -.-. -..- -.-. -..- -.-. -..-

Which, when decoded, reads:

AVIS FIRST MAIL AVISA

It appears to be a message related to airmail or postal services, possibly indicating that a package or letter is being sent via airmail.