| PHP version | 5.5.38 (need 5.5+) |
| PHP 5.5+ OK | ✓ YES |
| fsockopen() — SMTP connection | ✓ YES |
| mail() — local sending | ✓ YES |
| openssl extension | ✓ YES |
| stream_socket_enable_crypto (TLS) | ✓ YES |
| base64_encode() | ✓ YES |
| File uploads enabled | ✓ YES |
| Outbound port 25 (localhost SMTP) | ✓ YES |
| Outbound port 587 (STARTTLS) | ✓ YES |
| Outbound port 465 (SSL SMTP) | ✗ NO |