| Reason | Definition | Activity |
| 450 4.1.1 | Rejection when relay check is enabled | Blocked |
| 450 4.1.8 | Sender address rejected: Domain not found | Blocked |
| 450 4.5.5 | Header Checks Defer | Blocked |
| 450 4.5.6 | Temporary | Blocked |
| 450 4.5.7 | Temporary | Blocked |
| 504 5.5.2 | Sender address rejected: need fully-qualified address | Blocked |
| 550 5.1.1 | Recipient address rejected: undeliverable address | Blocked |
| 550 5.5.3 | Recipient address rejected: Multi-recipient bounce | Blocked |
| 552 5.2.2 | Sender/Recipient rejected | Blocked |
| 552 5.5.2 | Message size (content filter) | Blocked |
| 554 5.5.3 | e-mail Rejected Content Filter Size | Blocked |
| 554 5.5.4 | Spam IP rejected | Blocked |
| 554 5.5.5 | e-mail Rejected Spam | Blocked |
| 554 5.5.6 | Loop detection > 10 mal X-antispameurope-disclaimer | Blocked |
| 554 5.5.7 | e-mail Rejected Content Attachment | Blocked |
| 554 5.6.1 | Spam Header rejected | Blocked |
| 554.5.6.2 | Spam Link rejected | Blocked |
| 554 5.6.3 | Spam Body rejected | Blocked |
| 554 5.6.4 | Virus E-Mail Blocked | Blocked |
| 554 5.7.1 | unknown domain or unknown recipient (LDAP check) | Blocked |
| virus | Virus found (based on signature) | Virus |
| virus | Malware link, phishing or virus outbreak detected | Virus |
| admin-bl | Blacklist controlled by admin | Quarantined |
| ase-bl | Individual blacklist controlled by Support dep. | Quarantined |
| ase-recap1 | Diffuse spam fingerprint | Quarantined |
| ase-rep1 | IP reputation list1 | Quarantined |
| ase-rep2 | IP reputation list2 | Quarantined |
| ase-rep4 | URL / IP reputation list 4 | Quarantined |
| bodytag | Spam signature in mail text | Quarantined |
| dirtyip | Reputation filter on IP basis | Quarantined |
| fingerprint | Re-captured spam mail by hash | Quarantined |
| header | Spam signature in mail header | Quarantined |
| link | Ads link | Quarantined |
| rbl50 | pre-stage to 554 5.5.4 but not blocking yet | Quarantined |
| sameip | Signature recognition of spam engines | Quarantined |
| score | Dynamic contents evaluation | Quarantined |
| ScoreTag | Dynamic contents evaluation | Quarantined |
| spam | Reputation filter based on sender server | Quarantined |
| spamip-net | IP range of servers with poor reputation | Quarantined |
| spam-sum | Spam fingerprint | Quarantined |
| subjecttag | Spam signature in subject line | Quarantined |
| user-bl | Blacklist controlled by the user | Quarantined |
| wc | Spam pattern recognition | Quarantined |
| xarg | Bounce attack or individual customer rule | Quarantined |
| zombie | Botnet computer | Quarantined |
| content | Inadmissible attachment (content filter) | Content |
| admin-wl | Whitelist controlled by admin | Valid |
| asespf1 | Known sender, type 1 | Valid |
| asespf2 | Known sender, type 2 | Valid |
| ase-wl | Individual whitelist controlled by the support dep. | Valid |
| big2 | Maximum mail size valid for spam check exceeded | Valid |
| bigmessage | Maximum mail size valid for spam check exceeded | Valid |
| body-wl | Whitelist signature in mail text, type 1 | Valid |
| body-wl2 | Whitelist signature in mail text, type 2 | Valid |
| header-wl | Whitelist signature in header, type 1 | Valid |
| header-wl2 | Whitelist signature in header, type 2 | Valid |
| knownsender | Sender address with positive reputation, type 1 | Valid |
| noreason | Unevaluated mail | Valid |
| qsender2 | Sender address with positive reputation, type 2 | Valid |
| realbounce | Sent via bounce management | Valid |
| score | Dynamic contents evaluation | Valid |
| sender-ip | IP sender address has a positive reputation | Valid |
| subject-wl | Whitelist signature in subject line, type 1 | Valid |
| subject-wl2 | Whitelist signature in subject line, type 2 | Valid |
| user-wl | Whitelist controlled by user | Valid |
| xarg-wl | Bounce mail or individual customer rule | Valid |
