can not send mail

[mathslimin]

^@^@^@^@^@^@2017/11/29 23:33:35 mail.go:74: EOF
2017/11/29 23:33:35 server.go:2753: http: panic serving 127.0.0.1:19642: EOF
goroutine 6 [running]:
net/http.(*conn).serve.func1(0xc4200a5b80)
/usr/local/go/src/net/http/server.go:1721 +0xd0
panic(0x762c60, 0xc420184510)
/usr/local/go/src/runtime/panic.go:489 +0x2cf
log.Panic(0xc42005da38, 0x1, 0x1)
/usr/local/go/src/log/log.go:322 +0xc0
github.com/open-falcon/mail-provider/http.configProcRoutes.func1(0x983f60, 0xc42011a0e0, 0xc42000ad00)
/data/go/src/github.com/open-falcon/mail-provider/http/mail.go:74 +0x940
net/http.HandlerFunc.ServeHTTP(0x7fdf00, 0x983f60, 0xc42011a0e0, 0xc42000ad00)
/usr/local/go/src/net/http/server.go:1942 +0x44
net/http.(*ServeMux).ServeHTTP(0x9b60c0, 0x983f60, 0xc42011a0e0, 0xc42000ad00)
/usr/local/go/src/net/http/server.go:2238 +0x130
net/http.serverHandler.ServeHTTP(0xc42015a000, 0x983f60, 0xc42011a0e0, 0xc42000ad00)
/usr/local/go/src/net/http/server.go:2568 +0x92
net/http.(*conn).serve(0xc4200a5b80, 0x9846a0, 0xc420068dc0)
/usr/local/go/src/net/http/server.go:1825 +0x612
created by net/http.(*Server).Serve
/usr/local/go/src/net/http/server.go:2668 +0x2ce