Hello There !!
Just sending email is not important, I have developed automation tools for work around email marketing.
To get inbox delivery then you should warmup ip and domains to send emails, all configuration proper rDNS, spf, DKIM like this,
I have whole setup for this,
In Software one click pmta smtp setup done within 2 mins,
auto rDNS, SPF, DKIM configure within seconds,
Send bulk email software and track all like impressions, clicks, bounce,
in software upload suppression list,
auto email accounts (Seeds) creator for warm up process to make good reputation of server and domain,
automatically email accounts login, read emails, mark as not spam, moves emails in inbox, mark as important.
Many more with full setup
Please Message me to have further discussion and demo