Vorab per Fax

Leo: see per fax in advance - vorab per Fax

By fax, original to follow (or similar)

This doesn't seem to be used in Britain as much as in Germany, but here are some letters by English speakers:

By fax - original in post (Foster's, Australia)
BY FAX - ORIGINAL IN POST (Australia)
DELIVERED BY FAX - ORIGINAL TO FOLLOW (Canada)
Sent by Fax - Original in Mail (Canada)
Sent by fax and post (UK)
Sent by Fax (020 7527 3057) & Post (UK)
By fax . 020 7217 4882 (UK)
By Fax: 020 7282 2042 (UK)
By Post, by Fax and E-mail (UK)
By fax : 020 87S2 5080 (UK)