[ +filippo ] On Tue, Sep 17, 2019 at 1:14 AM Prabhash Rathore <prabhashrath...@gmail.com> wrote: > > Hello, > > We run one of the large volume MTA (Mail Transfer Agent) servers which is > responsible for receiving emails from internet. This SMTP server is > implemented in Golang. > > We notice around 2% of TLS connections (clients use Starttls to upgrade plain > connection to TLS) fail with following error: > tls: unsupported SSLv2 handshake received > > Grepping through Golang crypto code, it seems this error is thrown here: > https://github.com/golang/go/blob/a8c2e5c6adc0d8f9b976a55bf4e22fcf5770ea55/src/crypto/tls/conn.go#L610 > > Looking at comment, it seems Golang does not support SSLv2 and SSLV3. > > I am reaching out to see if there is anyway possible to add support for older > SSL versions or if there are any workarounds. In SMTP world, there are lots > of clients who still use old SSL builds and we would like to be able to > support them on our MTA servers. > > Our Environment Details: > Golang: 1.12.9 > OS: RHEL Server 7.6, > Kernel: 3.10 > > Appreciate any help/pointers. > > Thanks! > Prabhash Rathore > > -- > You received this message because you are subscribed to the Google Groups > "golang-nuts" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to golang-nuts+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/golang-nuts/3acb5184-acc1-405b-adc6-3536b4e6f121%40googlegroups.com.
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