When mail lands in spam

Bulk notices, short links and large attachments raise the spam score. Send the first messages to a few people, as plain text. If you suspect a blocklist, write the domain on a ticket. Do not write a password.

1. Confirm SPF, DKIM and, if needed, DMARC in DNS.
2. Try a subject without shouting and without a needless attachment.
3. If it still lands there, open a ticket with the sender address and one recipient example.