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SINGLE SERVER USAGE:
|----------------| |------| |------------------|
| Other mailer | ------> | SMTP | ------> | ^_^ Happy user |
|----------------| |------| |------------------|
The scheme above will work as long as SMTP service is available
or connection between your server and SMPT is up. Once network
failure occurs or SMTP service is down - users won't be happy
|----------------| \ / |------| |------------------|
| Other mailer | --X---> | SMTP | ------> | 0_o Disappointed |
|----------------| / \ |------| |------------------|
^- email lost in vain
Single SMTP solution may work in case of network or other failures
As long as MailTime has not received confirmation what email is sent
it will keep the letter in the queue and retry to send it again
|----------------| / |------| |------------------|
| Mail Time | --X---> | SMTP | ------> | ^_^ Happy user |
|---^------------| / |------| |------^-----------|
\-------------/ ^- We will try later /
\- put it back into queue /
\----------Once connection is back ------/
SINGLE SERVER WITH MULTIPLE SMTPs:
|--------|
/--X--| SMTP 1 |
/ ^ |--------|
/ \--- Retry with next provider
|----------------|/ |--------| |------------------|
| Mail Time | ---X--> | SMTP 2 | /->| ^_^ Happy user |
|----------------|\ ^ |--------| / |------------------|
\ \--- Retry /
\ |--------| /
\---->| SMTP 3 |--/
|--------|
CLUSTER USAGE (DURABILITY):
|===================THE=CLUSTER===================| |=QUEUE=|
| |----------| |----------| |----------| | | | |--------|
| | App | | App | | App | | | |-->| SMTP 1 |------\
| | Server 1 | | Server 2 | | Server 3 | | | | |--------| \
| |-----\----| |----\-----| |----\-----| | | | |-------------|
| \---------------\----------------\----------> | |--------| | ^_^ |
| | | |-->| SMTP 2 |-->| Happy users |
| Each "App Server" or "Cluster Node" | | | |--------| |-------------|
| runs MailTime as a "Server" | | | /
| for the maximum durability | | | |--------| /
| | | |-->| SMTP 3 |-----/
| | | | |--------|
|=================================================| |=======|
CLUSTER USAGE (MICROSERVICE):
|===================THE=CLUSTER===================| |=QUEUE=| |===Mail=Time===|
| |----------| |----------| |----------| | | | | | |--------|
| | App | | App | | App | | | | | Micro-service |-->| SMTP 1 |------\
| | Server 1 | | Server 2 | | Server 3 | | | | | running | |--------| \
| |-----\----| |----\-----| |----\-----| | | | | MailTime as | |-------------|
| \---------------\----------------\----------> | | "Server" only | |--------| | ^_^ |
| | | | | sending |-->| SMTP 2 |-->| Happy users |
| Each "App Server" runs MailTime as | | | | emails | |--------| |-------------|
| a "Client" only placing emails to the queue. | | <-------- | /
| | | --------> | |--------| /
| | | | | |-->| SMTP 3 |-----/
| | | | | | |--------|
|=================================================| |=======| |===============|
CLUSTER EXPLAINED (MICROSERVICE UNDER DIFFERENT ANLGE):
|====================THE=CLUSTER===================|
| |----------| |----------| |----------| |
| | App | | App | | App | |
| | Server 1 | | Server 2 | | Server 3 | |
| |-----|----| |----|-----| |-----/----| |
| | | / |
| |/--------------/---------------/ |
|========|=========================================|
|
|========|==QUEUE==========| |======Mail=Time======|
| V | |====Micro-service====|
| | | |
| <-------- |
| --------> | | |
|==========================| |=====|===|===========|
/ \
/-----------------/-----/ \
|---/----| |----/---| |-\------|
| SMTP 1 | | SMTP 2 | | SMTP 3 |
|---\----| |----|---| |---/----|
\ | /
\ |------V------| /
\ | | /
\-------> ^_^ <-----/
| Happy users |
|-------------|