英文邮件的开头可以根据不同的场合和收件人选择不同的称呼和问候语。以下是一些常见的开头方式：
正式场合
`Dear Sir or Madam,`
`To whom it may concern:`
`Dear Dr. XYZ, Professor XYZ, or Mr./Ms. ABC, `
半正式场合
`Hi [姓名],`
`Hello [姓名],`
`Hey [姓名],`
非正式场合
`Hi everyone,`
`Hey guys,`
`Hello [姓名],`
询问信息或感谢
`Thank you for contacting us. `
`Thank you for your [提供帮助的信息或时间].`
表达问候
`I hope you are well. `
`How have you been recently？`
`How are you doing？`
表达期待回复
`I am writing to [说明写信目的] and am looking forward to your reply. `
记得在开头之后紧接着写邮件的主要内容，并在结尾礼貌地结束邮件，如使用`Best regards, `
希望这些建议能帮助你撰写出合适的英文邮件开头