Sendmail: Reached EOF while searching for end marker

[Selim]

I am using vibe-d on Ubuntu/AWS-EC2 and trying to send an email over it. The script is simple and is from the vibe-d example. However, it gets stuck for a long time and throws an error message.

Code:

// D
import std.stdio;

// Third party
import vibe.core.log;
import vibe.mail.smtp;

void main()
{
writeln("Send mail.");
auto settings = new SMTPClientSettings("smtpout.secureserver.net", 465);
settings.authType = SMTPAuthType.plain;
settings.username = "[e-mail]";
settings.password = "password";
settings.connectionType = SMTPConnectionType.startTLS;

auto mail = new Mail;
mail.headers["Date"] = Clock.currTime(PosixTimeZone.getTimeZone("America/New_York")).toRFC822DateTimeString();
mail.headers["From"] = "<[e-mail]>";
mail.headers["To"] = "<[e-mail]>";
mail.headers["Subject"] = "Testmail";
mail.headers["Content-Type"] = "text/plain;charset=utf-8";
mail.bodyText = "Hello, World!";

logInfo("Sending mail...");
sendMail(settings, mail);
logInfo("done.");	
}

Error:

Running ./sendmail
Send mail.
[main(----) INF] Sending mail...
object.Exception@../../.dub/packages/vibe-d-0.9.5/vibe-d/stream/vibe/stream/operations.d(375): Reached EOF while searching for end marker.
----------------
/home/ubuntu/dlang/dmd-2.091.0/linux/bin64/../../src/phobos/std/exception.d:516 pure @safe void std.exception.bailOut!(Exception).bailOut(immutable(char)[], ulong, scope const(char)[]) [0x558a096b0802]
/home/ubuntu/dlang/dmd-2.091.0/linux/bin64/../../src/phobos/std/exception.d:437 pure @safe bool std.exception.enforce!().enforce!(bool).enforce(bool, lazy const(char)[], immutable(char)[], ulong) [0x558a096b077e]
../../.dub/packages/vibe-d-0.9.5/vibe-d/stream/vibe/stream/operations.d:375 @safe void vibe.stream.operations.readUntilSmall!(vibe.utils.array.AllocAppender!(ubyte[], ubyte).AllocAppender, vibe.internal.interfaceproxy.InterfaceProxy!(vibe.core.stream.Stream).InterfaceProxy).readUntilSmall(vibe.internal.interfaceproxy.InterfaceProxy!(vibe.core.stream.Stream).InterfaceProxy, ref vibe.utils.array.AllocAppender!(ubyte[], ubyte).AllocAppender, const(ubyte[]), ulong) [0x558a096bde67]
../../.dub/packages/vibe-d-0.9.5/vibe-d/stream/vibe/stream/operations.d:142 @safe void vibe.stream.operations.readUntil!(vibe.utils.array.AllocAppender!(ubyte[], ubyte).AllocAppender, vibe.internal.interfaceproxy.InterfaceProxy!(vibe.core.stream.Stream).InterfaceProxy).readUntil(vibe.internal.interfaceproxy.InterfaceProxy!(vibe.core.stream.Stream).InterfaceProxy, ref vibe.utils.array.AllocAppender!(ubyte[], ubyte).AllocAppender, const(ubyte[]), ulong) [0x558a096bdd3b]
../../.dub/packages/vibe-d-0.9.5/vibe-d/stream/vibe/stream/operations.d:56 @safe void vibe.stream.operations.readLine!(vibe.utils.array.AllocAppender!(ubyte[], ubyte).AllocAppender, vibe.internal.interfaceproxy.InterfaceProxy!(vibe.core.stream.Stream).InterfaceProxy).readLine(vibe.internal.interfaceproxy.InterfaceProxy!(vibe.core.stream.Stream).InterfaceProxy, ref vibe.utils.array.AllocAppender!(ubyte[], ubyte).AllocAppender, ulong, immutable(char)[]) [0x558a096bdc60]
../../.dub/packages/vibe-d-0.9.5/vibe-d/stream/vibe/stream/operations.d:41 @safe ubyte[] vibe.stream.operations.readLine!(vibe.internal.interfaceproxy.InterfaceProxy!(vibe.core.stream.Stream).InterfaceProxy).readLine(vibe.internal.interfaceproxy.InterfaceProxy!(vibe.core.stream.Stream).InterfaceProxy, ulong, immutable(char)[], stdx.allocator.IAllocator) [0x558a096bd318]
../../.dub/packages/vibe-d-0.9.5/vibe-d/mail/vibe/mail/smtp.d:259 @trusted immutable(char)[] vibe.mail.smtp.expectStatus!(vibe.internal.interfaceproxy.InterfaceProxy!(vibe.core.stream.Stream).InterfaceProxy).expectStatus(vibe.internal.interfaceproxy.InterfaceProxy!(vibe.core.stream.Stream).InterfaceProxy, int, immutable(char)[]).__lambda4() [0x558a096bd116]
../../.dub/packages/vibe-d-0.9.5/vibe-d/mail/vibe/mail/smtp.d:259 @safe void vibe.mail.smtp.expectStatus!(vibe.internal.interfaceproxy.InterfaceProxy!(vibe.core.stream.Stream).InterfaceProxy).expectStatus(vibe.internal.interfaceproxy.InterfaceProxy!(vibe.core.stream.Stream).InterfaceProxy, int, immutable(char)[]) [0x558a096bcf96]
../../.dub/packages/vibe-d-0.9.5/vibe-d/mail/vibe/mail/smtp.d:146 @safe void vibe.mail.smtp.sendMail(const(vibe.mail.smtp.SMTPClientSettings), vibe.mail.smtp.Mail) [0x558a096af23b]
source/app.d:25 _Dmain [0x558a096ac4ba]
Program exited with code 1

[Selim]

To give more context, smtpout.secureserver.net is Go Daddy's web server and I'm trying to send an e-mail to myself via my account.

[Sönke Ludwig]

The only likely cause that I can see is the server expecting a TLS connection, but an unencrypted one has been established. In that case you could try setting settings.connectionType = SMTPConnectionType.tls.

[Selim]

I did get a different response when I build/executed the following:

// D
import std.stdio;

// Third party
import vibe.core.log;
import vibe.mail.smtp;

void main()
{
	writeln("Send mail.");
	auto settings = new SMTPClientSettings("smtpout.secureserver.net", 465);
	settings.connectionType = SMTPConnectionType.tls;
	settings.authType = SMTPAuthType.none;
	settings.username = "[e-mail]";
	settings.password = "password";

	auto mail = new Mail;
	mail.headers["From"] = "<[e-mail]>";
	mail.headers["To"] = "<[e-mail]>";
	mail.headers["Subject"] = "Testmail";
	mail.bodyText = "Hello, World!";

	logInfo("Sending mail...");
	sendMail(settings, mail);
	logInfo("done.");	
}

The output is:
object.Exception@../../.dub/packages/vibe-d-0.9.5/vibe-d/tls/vibe/stream/openssl.d(668): Connecting TLS tunnel: error:1416F086:SSL routines:tls_process_server_certificate:certificate verify failed (337047686)

This sounds like a certificate issue. What's confusing to me is when I run a very similar program in python to send e-mail same way, it works without me mapping any certificate files. Is vibe-d different in that sense?

Best wishes,
Selim