Maurus Decimus

mySQL connections not returned to the pool when `fetch_optional` yields no results

4

### Bug Description When a query executed using `fetch_optional`returns no results, the connection is not returned to the pool. Once `max_connections` is exceeded all following connections fail with a `PoolTimedOut`...

See https://openid.net/specs/openid-connect-registration-1_0.html#RegistrationRequest

Replace all `impl Into` with `impl Into`.

Rustls support

3

**Describe the solution you'd like** Would like to have the possibility of using `rustls` as a crypto backend instead of `OpenSSL`.

[enhancement]: Autodiscover V2 support

2

### Which feature or improvement would you like to request? Related: https://www.msxfaq.de/exchange/autodiscover/autodiscover_v2.htm https://learn.microsoft.com/en-us/exchange/architecture/client-access/autodiscover?view=exchserver-2019 https://github.com/mustang-im/mustang/blob/master/app/logic/Mail/AutoConfig/exchangeConfig.ts#L239 https://github.com/mustang-im/mustang/blob/master/app/logic/Mail/AutoConfig/exchangeConfig.ts#L192 https://learn.microsoft.com/en-us/exchange/architecture/client-access/autodiscover?view=exchserver-2019 https://testconnectivity.microsoft.com/tests/O365Ola/input https://github.com/gronke/email-autodiscover/issues/4 https://ingogegenwarth.wordpress.com/2018/05/22/get-autodv2/ ### Is your feature request related to a problem? I'm having...

[enhancement]: SYN Flood attack protection

3

### Which feature or improvement would you like to request? Automatic defense against SYN flood attacks without needing a firewall. ### Is your feature request related to a problem? I'm...

### What happened? This happened: ``` smtp::inbound::session: event="write" data="535 5.7.8 Authentication credentials invalid.\r\n" size=47 smtp::inbound::auth: context="auth" event="authenticate" result="failed" smtp::inbound::session: event="read" data="AUTH OAUTHBEARER bixhPWluZm9AMC0wLmh1LAFhdXRoPUJlYXJlciAzaGdEYkVZcjZIQ2hXK2pYUTdlU2l3akplSk1IeUE0c2duVElnVHMreGQzcnZSeStxMGJnL24vSS8yWXVzaFZsU3N5dGx2RUNjbTkxYm1SamRXSmwBAQ==\r\n" size=175 imap::core::session: event="write" data="A0001 OK [CAPABILITY IMAP4rev2...

[enhancement]: Quarantine emails support

1

### Which feature or improvement would you like to request? Quarantine emails support ### Is your feature request related to a problem? I'm having a problem with... ### Code of...

### Which feature or improvement would you like to request? Pause entire message queue or individual messages ### Is your feature request related to a problem? I'm having a problem...