smtp
Simple Mail Transfer Protocol
About smtp
SMTP is the standard protocol for email transmission. It handles the routing and delivery of email messages between mail servers and from clients to servers.
Total Hosts
38.2M
Known CVEs
10
Countries
10+
Top Ports
| 25 | 20,691,553 |
| 587 | 11,767,153 |
| 465 | 4,475,693 |
| 21 | 921,318 |
| 26 | 150,055 |
| 9966 | 23,188 |
| 1234 | 6,029 |
| 80 | 4,923 |
| 110 | 3,736 |
| 2025 | 3,666 |
Top Countries
 United States |
7,449,465 |
 Germany |
5,097,088 |
 Japan |
2,403,614 |
 France |
2,341,218 |
 Netherlands |
1,915,234 |
 United Kingdom |
1,475,165 |
 Canada |
914,253 |
 Russia |
811,806 |
 Poland |
755,195 |
 Romania |
707,531 |
Top Products
| Postfix smtpd | 14,751,569 |
| Exim smtpd | 8,292,897 |
| cbdev cmail smtpd | 1,084,338 |
| Sendmail | 757,347 |
| Microsoft Exchange smtpd | 709,904 |
| ESMTP | 470,324 |
| MailEnable smptd | 410,326 |
| Exim | 220,869 |
| Kerio Connect smtpd | 121,636 |
| Postfix | 121,164 |
Top CVEs
| CVE-2025-67896 | 4,329,736 |
| CVE-2024-39929 | 3,334,729 |
| CVE-2023-51766 | 3,162,445 |
| CVE-2022-3559 | 2,849,631 |
| CVE-2023-42117 | 2,453,779 |
| CVE-2023-42119 | 2,453,779 |
| CVE-2023-42116 | 2,426,353 |
| CVE-2023-42115 | 2,426,353 |
| CVE-2023-42114 | 2,426,353 |
| CVE-2025-30232 | 1,790,145 |