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Top Forums Shell Programming and Scripting Sendmail Fails to send emails from Linux server. Post 303003198 by drysdalk on Saturday 9th of September 2017 03:55:55 AM
Old 09-09-2017
Hi,

OK, thanks - it would be interesting to know exactly why this didn't work, and what precisely caused the mail delivery to fail, which we'll hopefully get clues about from your mail logs.

One thing I'm not 100% clear on is why you actually need a smart relay here. Ultimately, barring there being networking restrictions in place that prevent your host communicating over SMTP with the outside world, there's nothing a dedicated smart relay box can do that your own local Sendmail install can't. Unless as I say something is configured on your network to stop your own dev box sending mail to the Internet, then it shoud be perfectly capable of delivering e-mail via SMTP to any host without needing a relay.

Of course, other hosts may well still reject that mail for a variety of reasons (e.g. they think it resembles spam, your IP/network range has a poor reputation, your reverse DNS doesn't match your forward DNS, you've gotten yourself listed on an RBL like Spamhaus, etc, etc). So if that's the reason you need a smart host - your own dev box is being rejected by other Internet hosts - then you'd need a smart host on your network that had none of the problems of your dev box, which might actually be hard to do.

Do you have a corporate SMTP gateway or mail server that deals with the normal incoming and outgoing e-mail for your whole site ? If so, can you maybe configure your smart relay to be that host instead. I imagine that somewhere locally you already have a host that handles routine e-mail functionality, and it might well be capable of acting as a smart relay in that case (though it will probably need to be configured to allow the IP of your dev box to relay through it).
 

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CALIBRE-SMTP(1) 						      calibre							   CALIBRE-SMTP(1)

NAME
calibre-smtp - part of calibre SYNOPSIS
calibre-smtp [options] [from to text] DESCRIPTION
Send mail using the SMTP protocol. calibre-smtp has two modes of operation. In the compose mode you specify from to and text and these are used to build and send an email message. In the filter mode, calibre-smtp reads a complete email message from STDIN and sends it. text is the body of the email message. If text is not specified, a complete email message is read from STDIN. from is the email address of the sender and to is the email address of the recipient. When a complete email is read from STDIN, from and to are only used in the SMTP negotiation, the message headers are not modified. Whenever you pass arguments to calibre-smtp that have spaces in them, enclose the arguments in quotation marks. OPTIONS
--version show program's version number and exit -h, --help show this help message and exit -l, --localhost Host name of localhost. Used when connecting to SMTP server. -o, --outbox Path to maildir folder to store failed email messages in. -f, --fork Fork and deliver message in background. If you use this option, you should also use --outbox to handle delivery failures. -t, --timeout Timeout for connection -v, --verbose Be more verbose COMPOSE MAIL Options to compose an email. Ignored if text is not specified -a, --attachment File to attach to the email -s, --subject Subject of the email SMTP RELAY Options to use an SMTP relay server to send mail. calibre will try to send the email directly unless --relay is specified. -r, --relay An SMTP relay server to use to send mail. --port Port to connect to on relay server. Default is to use 465 if encryption method is SSL and 25 otherwise. -u, --username Username for relay -p, --password Password for relay -e, --encryption-method Encryption method to use when connecting to relay. Choices are TLS and SSL. Default is TLS. SEE ALSO
The User Manual is available at http://calibre-ebook.com/user_manual Created by Kovid Goyal <kovid@kovidgoyal.net> calibre-smtp (calibre 0.6.53) July 2010 CALIBRE-SMTP(1)
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