SMTP error when trying to send a lot of emails

During testing I've tried to send all available AlmaLinux 9 advisories.
After successful sending some of them I got this error:

```
2022-08-17 13:46:19,003 DEBUG Sending email with subject: [Security Advisory] ALSA-2022:5736: java-17-openjdk security, bug fix, and enhancement update (Important)
2022-08-17 13:46:19,022 ERROR Could not send errata notification email
2022-08-17 13:46:19,024 DEBUG Sending email with subject: [Security Advisory] ALSA-2022:5948: galera, mariadb, and mysql-selinux security, bug fix, and enhancement update (Moderate)
2022-08-17 13:46:19,025 ERROR Could not send errata notification email
2022-08-17 13:46:19,027 DEBUG Sending email with subject: [Security Advisory] ALSA-2022:6002: kernel-rt security and bug fix update (Moderate)
2022-08-17 13:46:19,028 ERROR Could not send errata notification email
2022-08-17 13:46:19,029 DEBUG Sending email with subject: [Security Advisory] ALSA-2022:5942: vim security update (Moderate)
2022-08-17 13:46:19,030 ERROR Could not send errata notification email
2022-08-17 13:46:19,031 DEBUG Sending email with subject: [Security Advisory] ALSA-2022:5904: php security update (Important)
2022-08-17 13:46:19,031 ERROR Could not send errata notification email
2022-08-17 13:46:19,033 DEBUG Sending email with subject: [Security Advisory] ALSA-2022:6043: .NET 6.0 security, bug fix, and enhancement update (Moderate)
2022-08-17 13:46:19,034 ERROR Could not send errata notification email
2022-08-17 13:46:19,035 DEBUG Sending email with subject: [Security Advisory] ALSA-2022:6003: kernel security, bug fix, and enhancement update (Moderate)
2022-08-17 13:46:19,036 ERROR Could not send errata notification email
Traceback (most recent call last):
File "./errata-email-notifications", line 246, in
errata_notifications.run()
File "./errata-email-notifications", line 181, in run
self.smtp_session.close()
File "./errata-email-notifications", line 102, in close
self.__service.quit()
File "/usr/lib64/python3.6/smtplib.py", line 984, in quit
res = self.docmd("quit")
File "/usr/lib64/python3.6/smtplib.py", line 420, in docmd
self.putcmd(cmd, args)
File "/usr/lib64/python3.6/smtplib.py", line 367, in putcmd
self.send(str)
File "/usr/lib64/python3.6/smtplib.py", line 359, in send
raise SMTPServerDisconnected('please run connect() first')
smtplib.SMTPServerDisconnected: please run connect() first
```