名词
中文翻译：电子邮件发送设备同义词
同义词：
['email server', 'email gateway', 'email client']
例句：
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1. The company's email system is outdated and needs to be upgraded.
公司的电子邮件系统过时了，需要升级。
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2. I need to send an email to my boss about the meeting tomorrow.
我需要给老板发一封邮件，关于明天的会议。
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3. The email server is down, so we can't send emails right now.
电子邮件服务器出了问题，我们现在不能发送邮件。