[gnutls-devel] GnuTLS | msmtp unable to send mail with gnutls 3.6.5. TLS1.3 issue? (#644)

[Development of GNU's TLS library]

@sam.varshavchik In the GNU Wget project, we use blocking sockets and check for GNUTLS_E_AGAIN since 7.5 years. See commit 96c3ec36c:
```
96c3ec36c (Ray Satiro  2011-04-07 12:25:39 +0200 359)   while (ret == GNUTLS_E_INTERRUPTED || ret == GNUTLS_E_AGAIN);
```

There is no further description to explain why. But there must have been an issue around that time. Prior, the check was just `ret == GNUTLS_E_INTERRUPTED`.

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