Setting up dns for gmail and native smtp?

Question

gmail

there is an example.com domain
dns are managed through the panel from webnames
for mail, Google mail is used, those in the web interface of the mailbox are [email protected]logged in via gmail.
Google blocked this box for sending over the limit, through its smtp.
question:
Is it possible to create your own smtp server, for example smtp.example.com and send letters from it from the [email protected].
For other addresses [email protected], [email protected]continue to use the gmail web interface.
Is it possible to do so? can I specify all the necessary records in dns so that both Google and my server work correctly, so that all sorts of spf, ptr things are normal.
here are the current posts

example.com	IN	SOA	server:	ns1.nameself.com

example.com	 IN	MX	preference:	30
          exchange: 	aspmx5.googlemail.com
example.com	IN	MX	preference:	10
          exchange:	aspmx.l.google.com
example.com	IN	MX	preference:	20
          exchange:	alt1.aspmx.l.google.com
example.com	IN	MX	preference:	20
          exchange:	alt2.aspmx.l.google.com
example.com	IN	MX	preference:	30
          exchange:	aspmx2.googlemail.com
example.com	IN	MX	preference:	30
          exchange:	aspmx3.googlemail.com
example.com	IN	MX	preference:	30
          exchange:	aspmx4.googlemail.com

example.com	IN	TXT	v=spf1 include:_spf.google.com ~all
example.com	IN	NS	ns2.nameself.com
example.com	IN	NS	ns1.nameself.com
example.com	IN	A	0.0.0.0
1.1.1.1.in-addr.arpa	IN	PTR	0-0-0-0.rev.poneytelecom.eu
2.2.2.in-addr.arpa	IN	SOA	server:	nsa.online.net
2.2.2.in-addr.arpa	IN	NS	nsb.online.net
2.2.2.in-addr.arpa	IN	NS	nsa.online.net

Answer 1

Certainly you can. You raise on the smtp server, the main thing is that he would look at the Internet. Do not forget to set up authorization - so that no one is too lazy to send letters through it, otherwise it will be quickly added to the black list. And in general, that's all ... You can probably add a record from the ip of your server to the dns mx, so that it would be resolved by the recipient.
The only thing is that you have to use a third-party client to send emails (for example, Mozilla Thunderbird), because Google does not allow you to use third-party smtp from its interface, which is generally logical...