Applies to:
- mailRelay
- mailFeed
Description:
The follow tables details the typical response codes encountered using the mailRelay and mailFeed services. The 'prefix' and and 'specific response' are formatted 'Prefix:
| Category | Code | Prefix | Specific Response | Notes |
| Temporary | 4xx | HST-RTE | Hourly send rate exceeded, retry later. | Applies to standard packages only. |
| Temporary | 4xx | HST-RTE | Daily send rate exceeded, retry later | Applies to standard packages only. |
| Permanent | 5xx | SND-NUL | High Null sender rate | High volume of NDR/bounce messages encountered which is typical of a compromised host. |
| Permanent | 5xx | Restricted characters in address | The address contains characters that do not conform to RFC2822 | |
| Permanent | 5xx | SND-VFY | Sender domain does not exist | The sender domain does not resolve in DNS |
| Permanent | 5xx | RPT-VFY | Recipient domain does not exist | The recipient domain does not resolve in DNS |
| Permanent | 5xx | RPT-VFY | Recipient does not exist () | The recipient address does not exist |
| Permanent | 5xx | MSG-DOM | Envelope-From ( |
The 'From' address does not use a domain authorised for relay |
| Permanent | 5xx | MSG-DOM | Header-From ( |
The 'From' address does not use a domain authorised for relay |
| Permanent | 5xx | MSG-RFC | Your message does not conform to RFC2822 standard | |
| Permanent | 5xx | MSG-VMS | This message contains a virus, malware or spam ( |
|
| Permanent | 5xx | MSG-EXT | Blacklisted high risk file extension detected | (ade, adp, exe, com, bat, hta, ins, isp, jar, lib, lnk, mde, msc, msp, mst, pif, scr, sct, shb, sys, vb, vbe, vxd, wsc, wsf) |
| Permanent | 550 | Recipient domain not found in DNS | ||
| Permanent | 5xx | Relay Prohibited | The sending domain, IP address or authenticated login is not authorised to send |