exim4, smarthost, sending mail

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I configured the exim4 server to use a smarthost (my email company). I also turned on the header rewriting so that the address matches the one sent from the email company's domain. This domain requires SSL, and exim4 should, as far as I understand the documentation handle this correctly.

I switched on the header rewriting because I heard that smarthost will usually decline mail coming from a dynamic address assigned by a provider, unless the header is what is used by that domain.

Yet, I am unable to send anything. The process of sending email proceeds like this:

delivering 1QIL2j-0001Vw-F8
R: smarthost for dest@xxx.xx
T: remote_smtp_smarthost for dest@xxx.xx
LOG: retry_defer MAIN
== dest@xxx.xx R=smarthost T=remote_smtp_smarthost defer (-53): retry time not reached for any host