Python uses asyncio to achieve asynchronous email transmission and collection, supporting SMTP, POP3, and IMAP protocols

Preparation work: 1. Ensure that your Python version is 3.7 or higher, as the 'asyncio' library requires version 3.7 or higher to be used. 2. Install the required dependent class libraries: -'aiohttp': used for asynchronous HTTP requests, installation command: 'pip install aiohttp'` -'aiosmtplib': used for asynchronous SMTP mail transmission, installation command: 'pip install aiosmtplib'` -'aiopoplib': used for asynchronous POP3 email collection, installation command: 'pip install aiopoplib'` -'aiomonitor': used to monitor asyncio event loops, installation command: 'pip install aiomonitor'` The following is a complete example that demonstrates how to use 'asyncio' to asynchronously operate SMTP, POP3, and IMAP protocols for email transmission and collection. python import asyncio import aiosmtplib import aiopoplib import getpass SMTP_HOST = 'smtp.example.com' SMTP_PORT = 587 POP3_HOST = 'pop3.example.com' POP3_PORT = 995 IMAP_HOST = 'imap.example.com' IMAP_PORT = 993 async def send_email(): #Obtain sender's email and password from_email = input('Sender Email: ') password = getpass.getpass('Password: ') #Obtain recipient email to_email = input('Recipient Email: ') #Obtain email subject and content subject = input('Subject: ') body = input('Body: ') #Create an SMTP connection smtp = aiosmtplib.SMTP(hostname=SMTP_HOST, port=SMTP_PORT) await smtp.connect() await smtp.starttls() await smtp.login(from_email, password) #Sending an email message = f'From: {from_email} To: {to_email} Subject: {subject} {body}' await smtp.sendmail(from_email, [to_email], message) #Close SMTP connection await smtp.quit() print('Email sent successfully') async def receive_email(): #Obtain recipient email and password email = input('Email: ') password = getpass.getpass('Password: ') #Create a POP3 connection pop3 = aiopoplib.POP3(hostname=POP3_HOST, port=POP3_PORT) await pop3.connect() await pop3.starttls() await pop3.login(email, password) #Obtain the number and size of inbox emails response, mailbox_size, _ = await pop3.stat() print(f'Mailbox size: {mailbox_size}') print(f'Number of emails: {response}') #Get the latest email response, message, _ = await pop3.retr(response) #Parsing email content lines = [line.decode() for line in message] message = ' '.join(lines) print(f'Latest email: {message}') #Close POP3 connection await pop3.quit() async def main(): #Asynchronous operation of sending and receiving emails await asyncio.gather(send_email(), receive_email()) if __name__ == '__main__': #Start event loop asyncio.run(main()) Using the above example code, you can achieve asynchronous sending and receiving of emails through command line interaction. Summary: By using the 'asyncio' library and related asynchronous email class libraries, it is easy to achieve asynchronous email transmission and collection. Asynchronous operations can improve program efficiency and responsiveness, especially suitable for high concurrency application scenarios. This example code demonstrates how to use libraries such as' asyncio ',' aiosmtplib ', and' aiooplib 'to achieve asynchronous sending and receiving of emails. As needed, you can also use the 'aiomonitor' library to monitor asyncio event loops for more detailed runtime and performance analysis.